extended essay biology samples

IB Extended Essay: Past Essays

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• Language & literature (language A)
• Language acquisition (language B)
• Mathematics
• Visual Arts
• World Studies

Business Management

English a & b ee examples.

• English A EE Example
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Review Past Papers

• From the IB:  papers from other students and how they scored
• Renaissance Library Past Essays :  Links to all subject area examples

Music EE Examples

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Visual Arts EE Examples

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Film EE Examples

• Film Example 1
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Chemistry EE Examples

• Chemistry EE Example

Biology EE Examples

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Physics EE Examples

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Math EE Examples

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World Studies EE Examples

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The Complete IB Extended Essay Guide: Examples, Topics, and Ideas

International Baccalaureate (IB)

IB students around the globe fear writing the Extended Essay, but it doesn't have to be a source of stress! In this article, I'll get you excited about writing your Extended Essay and provide you with the resources you need to get an A on it.

If you're reading this article, I'm going to assume you're an IB student getting ready to write your Extended Essay. If you're looking at this as a potential future IB student, I recommend reading our introductory IB articles first, including our guide to what the IB program is and our full coverage of the IB curriculum .

IB Extended Essay: Why Should You Trust My Advice?

I myself am a recipient of an IB Diploma, and I happened to receive an A on my IB Extended Essay. Don't believe me? The proof is in the IBO pudding:

If you're confused by what this report means, EE is short for Extended Essay , and English A1 is the subject that my Extended Essay topic coordinated with. In layman's terms, my IB Diploma was graded in May 2010, I wrote my Extended Essay in the English A1 category, and I received an A grade on it.

What Is the Extended Essay in the IB Diploma Programme?

The IB Extended Essay, or EE , is a mini-thesis you write under the supervision of an IB advisor (an IB teacher at your school), which counts toward your IB Diploma (learn more about the major IB Diploma requirements in our guide) . I will explain exactly how the EE affects your Diploma later in this article.

For the Extended Essay, you will choose a research question as a topic, conduct the research independently, then write an essay on your findings . The essay itself is a long one—although there's a cap of 4,000 words, most successful essays get very close to this limit.

Keep in mind that the IB requires this essay to be a "formal piece of academic writing," meaning you'll have to do outside research and cite additional sources.

The IB Extended Essay must include the following:

• A title page
• Contents page
• Introduction
• Body of the essay
• References and bibliography

Additionally, your research topic must fall into one of the six approved DP categories , or IB subject groups, which are as follows:

• Group 1: Studies in Language and Literature
• Group 2: Language Acquisition
• Group 3: Individuals and Societies
• Group 4: Sciences
• Group 5: Mathematics
• Group 6: The Arts

Once you figure out your category and have identified a potential research topic, it's time to pick your advisor, who is normally an IB teacher at your school (though you can also find one online ). This person will help direct your research, and they'll conduct the reflection sessions you'll have to do as part of your Extended Essay.

As of 2018, the IB requires a "reflection process" as part of your EE supervision process. To fulfill this requirement, you have to meet at least three times with your supervisor in what the IB calls "reflection sessions." These meetings are not only mandatory but are also part of the formal assessment of the EE and your research methods.

According to the IB, the purpose of these meetings is to "provide an opportunity for students to reflect on their engagement with the research process." Basically, these meetings give your supervisor the opportunity to offer feedback, push you to think differently, and encourage you to evaluate your research process.

The final reflection session is called the viva voce, and it's a short 10- to 15-minute interview between you and your advisor. This happens at the very end of the EE process, and it's designed to help your advisor write their report, which factors into your EE grade.

Here are the topics covered in your viva voce :

• A check on plagiarism and malpractice
• Your reflection on your project's successes and difficulties
• Your reflection on what you've learned during the EE process

Your completed Extended Essay, along with your supervisor's report, will then be sent to the IB to be graded. We'll cover the assessment criteria in just a moment.

We'll help you learn how to have those "lightbulb" moments...even on test day!  

What Should You Write About in Your IB Extended Essay?

You can technically write about anything, so long as it falls within one of the approved categories listed above.

It's best to choose a topic that matches one of the IB courses , (such as Theatre, Film, Spanish, French, Math, Biology, etc.), which shouldn't be difficult because there are so many class subjects.

Here is a range of sample topics with the attached extended essay:

• Biology: The Effect of Age and Gender on the Photoreceptor Cells in the Human Retina
• Chemistry: How Does Reflux Time Affect the Yield and Purity of Ethyl Aminobenzoate (Benzocaine), and How Effective is Recrystallisation as a Purification Technique for This Compound?
• English: An Exploration of Jane Austen's Use of the Outdoors in Emma
• Geography: The Effect of Location on the Educational Attainment of Indigenous Secondary Students in Queensland, Australia
• Math: Alhazen's Billiard Problem
• Visual Arts: Can Luc Tuymans Be Classified as a Political Painter?

You can see from how varied the topics are that you have a lot of freedom when it comes to picking a topic . So how do you pick when the options are limitless?

How to Write a Stellar IB Extended Essay: 6 Essential Tips

Below are six key tips to keep in mind as you work on your Extended Essay for the IB DP. Follow these and you're sure to get an A!

#1: Write About Something You Enjoy

You can't expect to write a compelling essay if you're not a fan of the topic on which you're writing. For example, I just love British theatre and ended up writing my Extended Essay on a revolution in post-WWII British theatre. (Yes, I'm definitely a #TheatreNerd.)

I really encourage anyone who pursues an IB Diploma to take the Extended Essay seriously. I was fortunate enough to receive a full-tuition merit scholarship to USC's School of Dramatic Arts program. In my interview for the scholarship, I spoke passionately about my Extended Essay; thus, I genuinely think my Extended Essay helped me get my scholarship.

But how do you find a topic you're passionate about? Start by thinking about which classes you enjoy the most and why . Do you like math classes because you like to solve problems? Or do you enjoy English because you like to analyze literary texts?

Keep in mind that there's no right or wrong answer when it comes to choosing your Extended Essay topic. You're not more likely to get high marks because you're writing about science, just like you're not doomed to failure because you've chosen to tackle the social sciences. The quality of what you produce—not the field you choose to research within—will determine your grade.

Once you've figured out your category, you should brainstorm more specific topics by putting pen to paper . What was your favorite chapter you learned in that class? Was it astrophysics or mechanics? What did you like about that specific chapter? Is there something you want to learn more about? I recommend spending a few hours on this type of brainstorming.

One last note: if you're truly stumped on what to research, pick a topic that will help you in your future major or career . That way you can use your Extended Essay as a talking point in your college essays (and it will prepare you for your studies to come too!).

#2: Select a Topic That Is Neither Too Broad nor Too Narrow

There's a fine line between broad and narrow. You need to write about something specific, but not so specific that you can't write 4,000 words on it.

You can't write about WWII because that would be a book's worth of material. You also don't want to write about what type of soup prisoners of war received behind enemy lines, because you probably won’t be able to come up with 4,000 words of material about it. However, you could possibly write about how the conditions in German POW camps—and the rations provided—were directly affected by the Nazis' successes and failures on the front, including the use of captured factories and prison labor in Eastern Europe to increase production. WWII military history might be a little overdone, but you get my point.

If you're really stuck trying to pinpoint a not-too-broad-or-too-narrow topic, I suggest trying to brainstorm a topic that uses a comparison. Once you begin looking through the list of sample essays below, you'll notice that many use comparisons to formulate their main arguments.

I also used a comparison in my EE, contrasting Harold Pinter's Party Time with John Osborne's Look Back in Anger in order to show a transition in British theatre. Topics with comparisons of two to three plays, books, and so on tend to be the sweet spot. You can analyze each item and then compare them with one another after doing some in-depth analysis of each individually. The ways these items compare and contrast will end up forming the thesis of your essay!

When choosing a comparative topic, the key is that the comparison should be significant. I compared two plays to illustrate the transition in British theatre, but you could compare the ways different regional dialects affect people's job prospects or how different temperatures may or may not affect the mating patterns of lightning bugs. The point here is that comparisons not only help you limit your topic, but they also help you build your argument.

Comparisons are not the only way to get a grade-A EE, though. If after brainstorming, you pick a non-comparison-based topic and are still unsure whether your topic is too broad or narrow, spend about 30 minutes doing some basic research and see how much material is out there.

If there are more than 1,000 books, articles, or documentaries out there on that exact topic, it may be too broad. But if there are only two books that have any connection to your topic, it may be too narrow. If you're still unsure, ask your advisor—it's what they're there for! Speaking of advisors...

Don't get stuck with a narrow topic!

#3: Choose an Advisor Who Is Familiar With Your Topic

If you're not certain of who you would like to be your advisor, create a list of your top three choices. Next, write down the pros and cons of each possibility (I know this sounds tedious, but it really helps!).

For example, Mr. Green is my favorite teacher and we get along really well, but he teaches English. For my EE, I want to conduct an experiment that compares the efficiency of American electric cars with foreign electric cars.

I had Ms. White a year ago. She teaches physics and enjoyed having me in her class. Unlike Mr. Green, Ms. White could help me design my experiment.

Based on my topic and what I need from my advisor, Ms. White would be a better fit for me than would Mr. Green (even though I like him a lot).

The moral of my story is this: do not just ask your favorite teacher to be your advisor . They might be a hindrance to you if they teach another subject. For example, I would not recommend asking your biology teacher to guide you in writing an English literature-based EE.

There can, of course, be exceptions to this rule. If you have a teacher who's passionate and knowledgeable about your topic (as my English teacher was about my theatre topic), you could ask that instructor. Consider all your options before you do this. There was no theatre teacher at my high school, so I couldn't find a theatre-specific advisor, but I chose the next best thing.

Before you approach a teacher to serve as your advisor, check with your high school to see what requirements they have for this process. Some IB high schools require your IB Extended Essay advisor to sign an Agreement Form , for instance.

Make sure that you ask your IB coordinator whether there is any required paperwork to fill out. If your school needs a specific form signed, bring it with you when you ask your teacher to be your EE advisor.

#4: Pick an Advisor Who Will Push You to Be Your Best

Some teachers might just take on students because they have to and aren't very passionate about reading drafts, only giving you minimal feedback. Choose a teacher who will take the time to read several drafts of your essay and give you extensive notes. I would not have gotten my A without being pushed to make my Extended Essay draft better.

Ask a teacher that you have experience with through class or an extracurricular activity. Do not ask a teacher that you have absolutely no connection to. If a teacher already knows you, that means they already know your strengths and weaknesses, so they know what to look for, where you need to improve, and how to encourage your best work.

Also, don't forget that your supervisor's assessment is part of your overall EE score . If you're meeting with someone who pushes you to do better—and you actually take their advice—they'll have more impressive things to say about you than a supervisor who doesn't know you well and isn't heavily involved in your research process.

Be aware that the IB only allows advisors to make suggestions and give constructive criticism. Your teacher cannot actually help you write your EE. The IB recommends that the supervisor spends approximately two to three hours in total with the candidate discussing the EE.

#5: Make Sure Your Essay Has a Clear Structure and Flow

The IB likes structure. Your EE needs a clear introduction (which should be one to two double-spaced pages), research question/focus (i.e., what you're investigating), a body, and a conclusion (about one double-spaced page). An essay with unclear organization will be graded poorly.

The body of your EE should make up the bulk of the essay. It should be about eight to 18 pages long (again, depending on your topic). Your body can be split into multiple parts. For example, if you were doing a comparison, you might have one third of your body as Novel A Analysis, another third as Novel B Analysis, and the final third as your comparison of Novels A and B.

If you're conducting an experiment or analyzing data, such as in this EE , your EE body should have a clear structure that aligns with the scientific method ; you should state the research question, discuss your method, present the data, analyze the data, explain any uncertainties, and draw a conclusion and/or evaluate the success of the experiment.

#6: Start Writing Sooner Rather Than Later!

You will not be able to crank out a 4,000-word essay in just a week and get an A on it. You'll be reading many, many articles (and, depending on your topic, possibly books and plays as well!). As such, it's imperative that you start your research as soon as possible.

Each school has a slightly different deadline for the Extended Essay. Some schools want them as soon as November of your senior year; others will take them as late as February. Your school will tell you what your deadline is. If they haven't mentioned it by February of your junior year, ask your IB coordinator about it.

Some high schools will provide you with a timeline of when you need to come up with a topic, when you need to meet with your advisor, and when certain drafts are due. Not all schools do this. Ask your IB coordinator if you are unsure whether you are on a specific timeline.

Below is my recommended EE timeline. While it's earlier than most schools, it'll save you a ton of heartache (trust me, I remember how hard this process was!):

• January/February of Junior Year: Come up with your final research topic (or at least your top three options).
• February of Junior Year: Approach a teacher about being your EE advisor. If they decline, keep asking others until you find one. See my notes above on how to pick an EE advisor.
• April/May of Junior Year: Submit an outline of your EE and a bibliography of potential research sources (I recommend at least seven to 10) to your EE advisor. Meet with your EE advisor to discuss your outline.
• Summer Between Junior and Senior Year: Complete your first full draft over the summer between your junior and senior year. I know, I know—no one wants to work during the summer, but trust me—this will save you so much stress come fall when you are busy with college applications and other internal assessments for your IB classes. You will want to have this first full draft done because you will want to complete a couple of draft cycles as you likely won't be able to get everything you want to say into 4,000 articulate words on the first attempt. Try to get this first draft into the best possible shape so you don't have to work on too many revisions during the school year on top of your homework, college applications, and extracurriculars.
• August/September of Senior Year: Turn in your first draft of your EE to your advisor and receive feedback. Work on incorporating their feedback into your essay. If they have a lot of suggestions for improvement, ask if they will read one more draft before the final draft.
• September/October of Senior Year: Submit the second draft of your EE to your advisor (if necessary) and look at their feedback. Work on creating the best possible final draft.
• November-February of Senior Year: Schedule your viva voce. Submit two copies of your final draft to your school to be sent off to the IB. You likely will not get your grade until after you graduate.

Remember that in the middle of these milestones, you'll need to schedule two other reflection sessions with your advisor . (Your teachers will actually take notes on these sessions on a form like this one , which then gets submitted to the IB.)

I recommend doing them when you get feedback on your drafts, but these meetings will ultimately be up to your supervisor. Just don't forget to do them!

The early bird DOES get the worm!

How Is the IB Extended Essay Graded?

Extended Essays are graded by examiners appointed by the IB on a scale of 0 to 34 . You'll be graded on five criteria, each with its own set of points. You can learn more about how EE scoring works by reading the IB guide to extended essays .

• Criterion A: Focus and Method (6 points maximum)
• Criterion B: Knowledge and Understanding (6 points maximum)
• Criterion C: Critical Thinking (12 points maximum)
• Criterion D: Presentation (4 points maximum)
• Criterion E: Engagement (6 points maximum)

How well you do on each of these criteria will determine the final letter grade you get for your EE. You must earn at least a D to be eligible to receive your IB Diploma.

Although each criterion has a point value, the IB explicitly states that graders are not converting point totals into grades; instead, they're using qualitative grade descriptors to determine the final grade of your Extended Essay . Grade descriptors are on pages 102-103 of this document .

Here's a rough estimate of how these different point values translate to letter grades based on previous scoring methods for the EE. This is just an estimate —you should read and understand the grade descriptors so you know exactly what the scorers are looking for.

Here is the breakdown of EE scores (from the May 2021 bulletin):

How Does the Extended Essay Grade Affect Your IB Diploma?

The Extended Essay grade is combined with your TOK (Theory of Knowledge) grade to determine how many points you get toward your IB Diploma.

To learn about Theory of Knowledge or how many points you need to receive an IB Diploma, read our complete guide to the IB program and our guide to the IB Diploma requirements .

This diagram shows how the two scores are combined to determine how many points you receive for your IB diploma (3 being the most, 0 being the least). In order to get your IB Diploma, you have to earn 24 points across both categories (the TOK and EE). The highest score anyone can earn is 45 points.

Let's say you get an A on your EE and a B on TOK. You will get 3 points toward your Diploma. As of 2014, a student who scores an E on either the extended essay or TOK essay will not be eligible to receive an IB Diploma .

Prior to the class of 2010, a Diploma candidate could receive a failing grade in either the Extended Essay or Theory of Knowledge and still be awarded a Diploma, but this is no longer true.

Figuring out how you're assessed can be a little tricky. Luckily, the IB breaks everything down here in this document . (The assessment information begins on page 219.)

40+ Sample Extended Essays for the IB Diploma Programme

In case you want a little more guidance on how to get an A on your EE, here are over 40 excellent (grade A) sample extended essays for your reading pleasure. Essays are grouped by IB subject.

• Business Management 1
• Chemistry 1
• Chemistry 2
• Chemistry 3
• Chemistry 4
• Chemistry 5
• Chemistry 6
• Chemistry 7
• Computer Science 1
• Economics 1
• Design Technology 1
• Design Technology 2
• Environmental Systems and Societies 1
• Geography 1
• Geography 2
• Geography 3
• Geography 4
• Geography 5
• Geography 6
• Literature and Performance 1
• Mathematics 1
• Mathematics 2
• Mathematics 3
• Mathematics 4
• Mathematics 5
• Philosophy 1
• Philosophy 2
• Philosophy 3
• Philosophy 4
• Philosophy 5
• Psychology 1
• Psychology 2
• Psychology 3
• Psychology 4
• Psychology 5
• Social and Cultural Anthropology 1
• Social and Cultural Anthropology 2
• Social and Cultural Anthropology 3
• Sports, Exercise and Health Science 1
• Sports, Exercise and Health Science 2
• Visual Arts 1
• Visual Arts 2
• Visual Arts 3
• Visual Arts 4
• Visual Arts 5
• World Religion 1
• World Religion 2
• World Religion 3

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2016-2025 IB Extended Essay: Sample IB EE's

• Workshop 1: Getting started
• Workshop 2: EE Options
• Workshop 3: Selecting a topic
• Workshop 4:Research Questions
• Workshop 5: Supervisors and Reflections
• Finding Books & Ebooks
• Primary Sources
• Citation Guide
• Subject guidance
• Sample IB EE's

• Biology (2018 new rubric)
• Biology Light Intensity
• Does Age Have an Effect on Short-term Memory of 6 to 18 Year Old Students?

Chemistry: 

• Chemistry 1
• What are the Alternative Fuels for the Depleting Fossil Fuels and which is the Best Fuel in Accordance with the Energy Output?
• A Copper Ions
• Chemistry 3

Design Technology

• Does Hull Trim and Balance Affect the Speed of a Boat?

Individuals & Society:

• Market Form of the Retail Petroleum Supply Industry in Parklands
• Economics 1
• Economics 2
• Economics 3

I have an exemplar but the file is too big to upload.  If you are interested in this topic I can share the essay with you.

• Geography 2
• History EE (2018 new rubric)
• To What Extent was the Establishment of the State of Israel in Palestine in 1948, Influenced by Theodor Herzl?

Information Technology in a Global Society

• Philosophy 1
• Philosophy 2
• Philosophy 3
• Philosophy 4
• Psychology EE (2018 new rubric)
• Applied Behavior Analysis and Early Intervention: The Extent of Recovery from Autism
• Psychology 1
• Psychology 2
• Psychology 3

Social & Cultural Anthropology

• Social & Cultural Anthropology 1
• Social & Cultural Anthropology 2

World Religions

• To What Extent do the Core Scriptural Teachings of Sikhism Permit them to Marry Outside of the Religion?
• World Religions 1
• World Religions 2

Language Acquisition:

• French: Les Liaisons Dangereuses

Literature & Language 

•   Journeys in the Inferno and The Wonderful Wizard of Oz   
•   Toni Morrison 

Math: 

•   Cryptography and Rubik's Cube: An Investigative Analysis   
•   Pascal's Triangle 

Visual Arts: 

•   How Does the work of Yinka Shonibare Illustrate the Changing Role of African Art in a Global Society? 
• Ballet's Accessibility and Costumes Affecting Society's View of the Art Form
• Visual Arts 1
• Visual Arts 4

Interdisciplinary Essays:

Environmental Systems & Societies

• ESS Extended Essay (2018 new rubric)

World Studies

• World Studies EE History, Economics, & Politics  (2018 new rubric)
• Does the Production of Dairy and Meat from Dairy Cows in the United States affect the Environment and Well Being of Animals and Humans?
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• Last Updated: Aug 25, 2024 12:34 PM
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Extended Essay Writers

Biology EE Topics | 40 Ideas

Luke MacQuoid

There are many potential topics for a biology Extended Essay (EE) in the International Baccalaureate (IB) program.

Topic Ideas

Some possibilities include the following:

• The effects of pollution on a particular species or ecosystem.
• The genetic basis of a specific disease or trait.
• The comparative physiology of a specific mammal and bird.
• The effects of climate change on a particular species or ecosystem.
• The impact of human activity on the evolution of a species.
• The physiology of a specific plant species.
• The efficacy of a specific medicinal plant.
• The comparison of the anatomy and physiology of a specific animal species in captivity and in the wild.
• The impact of a specific invasive species on an ecosystem.
• The effect of different fertilizers on the growth and development of a specific plant species.
• The study of the symbiotic relationship between specific species.
• The effect of different light conditions on the growth and development of a specific plant species.
• The impact of different temperature conditions on the physiology of a specific microorganism.
• The study of the genetic diversity within a specific species.
• The study of the effects of different pH levels on the growth and development of a specific plant species.
• The impact of human activity on the population dynamics of a specific species.
• The study of the effects of different soil types on the growth and development of a specific plant species.
• The study of the impacts of different pesticides on the physiology of a specific species.
• The study of the effects of different water conditions on the growth and development of a specific plant species.
• The study of the impact of ocean acidification on the physiology of a specific marine species.
• Studying the Effects of Acid Rain on Local Flora.
• The Role of Gut Microbiota in Obesity.
• Influence of Insecticides on Honey Bee Population Decline.
• The Effects of Microplastics on Aquatic Food Chains.
• The Role of Genetics in Determining Human Lifespan.
• Influence of Habitat Loss on the Genetic Diversity of a Specific Species.
• The Effects of Light Pollution on Nocturnal Animals.
• A Comparative Study of Photosynthesis Rates in Different Plant Species.
• The Impact of Noise Pollution on Avian Communication.
• Analysis of Biological Controls for Invasive Species.
• The Effects of Diet on the Gut Microbiota.
• Understanding the Effect of Climate Change on Disease Vectors.
• Exploring the Role of Genetics in Athletic Performance.
• Effects of Pharmaceuticals on Aquatic Ecosystems.
• The Impact of Urbanization on Local Bird Species.
• Understanding the Relationship Between Sleep and Immune Function.
• Studying the Effects of Air Pollution on Lichen Species.
• The Role of Epigenetics in Aging.
• The Effect of Vegan and Vegetarian Diets on the Human Body.
• Investigating the Biological Mechanisms of Meditation and Mindfulness.

It’s important to note that these are just examples of topics for your IB EE in Biology . You should choose a topic that interests you and that you can find enough information on.

Need help with your Biology extended essay?

From research and analysis to structuring and editing, our skilled mentors will be by your side, helping you craft an exceptional extended essay that not only meets the stringent IB criteria but also reflects your passion for Biology studies.

Additionally, it’s essential to consult with your supervisor to make sure the topic meets the requirements of the Extended Essay and that you have access to the necessary resources to complete the research.

Students can use these themes in their essays by researching and analyzing the specific topic, providing evidence and examples to support their claims, and discussing the implications and potential solutions to the issue at hand.

For example, in an essay on the effects of pollution on a particular species or ecosystem, a student could research the specific pollutants that are affecting the species or ecosystem, analyze the effects those pollutants are having, and discuss potential solutions to mitigate the pollution and its effects.

These are experiments students can use for Biology EE topics:

• Looking at how pollution impacts a certain type of animal or plant: This would involve checking out pollution levels in a specific place, then watching to see how it affects your chosen species.
• Understanding how certain genes affect a disease or characteristic: This would mean doing genetic tests to identify the genes involved, and potentially using genetic engineering techniques to change those genes and see what happens.
• Comparing how a mammal and a bird work: You’d do experiments to see how your chosen mammal and bird are similar or different. You could look at things like brain structure, behaviour, and thinking abilities.
• Exploring how climate change impacts a certain animal, plant, or ecosystem: This could involve experiments to see how changes in temperature, rain patterns, or CO2 levels affect your chosen species or ecosystem.
• Studying how people’s actions affect how a species evolves: This might mean looking at how things like habitat destruction, hunting, or pollution impact a species’ genetic diversity and population.
• Looking at how a certain plant works: You’d do experiments to see how the plant responds to things like light, temperature, or water.
• Studying how well a medicinal plant works: You’d do experiments to see how good the plant is at killing or slowing the growth of microbes, or reducing pain or inflammation.
• Comparing a certain animal in captivity and in the wild: You’d look at how being in captivity affects the animal’s body and how it works, and how it behaves.
• Seeing how an invasive species affects an ecosystem: You’d study how your chosen invasive species impacts the growth, reproduction, and health of native species.
• Studying how different fertilizers affect a plant: This could involve testing different types of fertilizers to see how they affect the plant’s growth rate, leaf size, and health.
• Looking at how certain species interact: You’d do experiments to understand the relationship between the species. This could involve seeing what happens when you remove one species, or how different environments affect the relationship.
• Studying how light affects a plant: This might mean doing experiments to see how different light conditions affect the plant’s growth, leaf size, and health.
• Looking at how temperature affects a microorganism: You’d do experiments to see how different temperatures impact the microorganism’s growth rate, metabolism, and health.
• Studying genetic diversity in a species: This could involve using genetic markers to identify genetic variations in the species, and then seeing how these variations affect the organism.
• Looking at how pH levels affect a plant: You’d do experiments to see how different pH levels impact the plant’s growth, leaf size, and health.
• Studying how people’s actions affect a species’ population: This might mean looking at how things like habitat destruction, hunting, or pollution impact the species’ population size, growth rate, and health.
• Looking at how soil types affect a plant: This could involve doing experiments to see how different types of soil affect the plant’s growth, leaf size, and health.
• Studying how pesticides affect a species: This might mean doing experiments to see how different pesticides impact the species’ growth, reproduction, and health.
• Looking at how water conditions affect a plant: You’d do experiments to see how different water conditions (like availability, salt levels, or temperature) affect the plant’s growth, leaf size, and health.
• Studying how ocean acidification affects a marine species: This could involve doing experiments to see how increasing acidity levels impact the species’ growth, reproduction, and health.

Additionally, in an essay on the comparative psychiatry of a specific mammal and bird, a student could research and compare the brain structures, behaviors, and cognitive abilities of the two species and discuss any similarities and differences found.

A student can ask for help from a writing service if they need assistance with their essay. This can bring several benefits to the student, such as:

• Professional guidance . Writing services often have experienced writers and editors who can provide guidance on the essay topic and structure, as well as help with research and editing.
• Improved quality . A writing service can help improve the overall quality of the essay, including grammar, punctuation, and formatting.
• Better grades . With the help of a writing service, a student’s essay is likely to be of higher quality, which can lead to better grades.
• Time-saving . A writing service can help save time as the student can focus on other responsibilities while the writing service works on the essay.
• Customization . Writing services can also provide a customized service that can be tailored to the student’s specific needs and requirements.
• Originality . Professional writers will provide original work that is free from plagiarism, which is important in academic writing.

It is important to note, however, that a student should always ensure that the writing service they use is reputable and that they review and understand the work they receive before submitting it as their own.

Luke MacQuoid has extensive experience teaching English as a foreign language in Japan, having worked with students of all ages for over 12 years. Currently, he is teaching at the tertiary level. Luke holds a BA from the University of Sussex and an MA in TESOL from Lancaster University, both located in England. As well to his work as an IB Examiner and Master Tutor, Luke also enjoys sharing his experiences and insights with others through writing articles for various websites, including extendedessaywriters.com blog

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Extended Essay (First Exams 2018): Examples of Extended Essays

• EE Intro to Inquiry
• Examples of Extended Essays
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Samples from the IBO

The IBO publishes two volumes of  50 Excellent Extended Essays , covering all Diploma Programme groups -- and all scored a top A grade.

Click on the link below to access PDFs of the essays. 

50 Excellent Extended Essays

All 50 essays are also available in electronic form in the QD Library on the iPads.  Look for the display at the circulation desk. The essays are found in the iBooks app. The iPads are available for check out at the circulation for periods of 30 minutes at one time.

Recently, the IBO has produced another list of exemplars with marks. Click on the link below to access this:

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Biology Extended Essay: The Complete Guide for IB Students

by  Antony W

March 13, 2023

Biology Extended Essay is an assignment that requires you to explore biological issue relevant to you and your environment.

Your focus should be on a particular biological emphasis within a broader context of scientific investigation. Given that the focus is on a biological system, you’ll have to make an analytical argument as you write the essay.

In this guide, you’ll learn exactly what you need to know about the IB Biology Extended Essay . Our goal with this lesson is to give you the most important information about the subject so that you can get the assignment done right.

What is Biology in an IB Extended Essay?

Biology in IB Extended Essay is the examination of living organisms and their life processes. The assignment integrates biological theories and examines the nature of the subject.

While you can approach a Biology EE from varying viewpoints, the treatment of the material used in your investigation must be 100% biological.

IB Biology Extended Essay Topics

The topic you choose to explore in your IB Biology Extended Essay shouldn’t be too broad or too narrow. Make sure you choose a focused topic that’s easy to investigate and easy to explain.

Your teacher expects you to explain how you arrived at your research question, and the best way to do that is to outline the aspects you wish to consider in the essay.

You may also have to formulate one or more hypothesis based on the research question.

The EE guide on the subject recommends that you choose your topics carefully, making sure you refrain from inappropriate topics such as those that are likely to inflict pain, involve the use of dangerous substances, or linked to safety concern.

You should avoid topics whose outcome are either obvious or already well known and documented in textbooks.

Doing Research for Your IB Biology Extended Essay

You will need to do primary and secondary research for your Biology Extended Essay.

1. Primary Research

For primary research, you can collect data from fieldwork, surveys, biological drawings, and biological observations.

If you’ve picked topic that requires practical work, you may have to conduct multiple, extensive fieldwork or do lab tests. In such a case, you will have to provide a detailed explanation of the experimental research procedures sued.

2. Secondary Research

When it comes to secondary research, you get data or information from literature.

Some students restate the information they collect from secondary sources, but doing so often adds little or no value to a Biology Extended Essay.

Therefore, the right approach is to analyze the data or information in an original way to add a new dimension and value to your research and to the essay at large.

Whether you do primary research, secondary research, or a combination of both, you need to make sure you have access to enough data or information to answer your research question.

How Do You Write an IB Biology Extended Essay?

The first step to writing a comprehensive, 4,000-word essay in Biology EE is to use the right scientific techniques to analyze the data you collect during research.

You then have to present your argument or evaluation based on the analysis you’ve completed.

You can include graphs, tables, and diagrams, and make sure you point out their significance in the essay so they’re easy to understand.

As with any other EE, your Biology essay should have a good structure and demonstrate a logical progression. Feel free to use headings and subheadings in the essay because it imposes a concise structure.

Your evaluation of the research questions should demonstrate that you not only understand the results from your experiments but also can explain their significance in a wider academic context.

Since you aren’t sure about what to expect from biological experiments, you may have to account for anomalies or unexpected results in your investigation.

In such a case, you have to provide explanations for the expected outcome and give an alternative explanation for such findings.

The subject also allows you to propose slight or major changes to the hypothesis presented in the essay, in which case you will have to suggest relevant approaches to testing the new changes.

Evaluation of Your Biology EE

Writing your EE in Biology also requires that you undertake a critical evaluation of the work that you have already done.

The evaluation helps you to identify and explain the limitation of your research by a number of factors including the reliability and validity of statistics, the precision of experimenting equipment and the reliability of sources.

You also need to consider biological limitations of your research. Such limitations are likely to arise from the inability to generalize based on a single form of an organism or problems of control and repeatability when using living organisms in your research.

Biology Internal Assessment vs Biology Extended Essay

It’s important to keep in mind that a Biology Extended Essay is not an extension of the Internal Assessment in the same subject. There are a few differences that set the two assignments apart, and it’s important to know them before you start working on the essay.

Get Extended Essay Writing Help

Do you need help with your Extended Essay in Biology? Our team of IB experts is here to help you write the 4,000-word essay, even if it’s on a complex topic. You can click here to learn more.

About the author 

Antony W is a professional writer and coach at Help for Assessment. He spends countless hours every day researching and writing great content filled with expert advice on how to write engaging essays, research papers, and assignments.

Extended Essay: Sciences: Biology

• Step 1 - Choosing a Subject
• Step 2 - Choosing a Topic
• Step 3 - Draft a Research Question
• Step 4 - Finding Sources
• Step 5 - Evaluating Information
• Step 6 - Bibliography & Citation
• Step 7 - Organizing Information
• The Arts: Visual Arts
• Individuals & Societies: Business Management
• Individuals & Societies: History
• Individuals & Societies: Psychology
• Language Acquisition
• Language and Literature
• Sciences: Biology
• Sciences: Sports, Exercise, and Health Sciences
• Interdisciplinary Papers: World Studies
• Assessment Criteria
• Research Questions
• Investigation

Extended Essay in Biology

Extended Essays in Biology

Choosing a topic

Choosing a Topic

Biology is the science that deals with living organisms and life processes. A biology EE should incorporate biological theory and emphasize why it is relevant today.

The topic must relates specifically to biology. Many topics can be approached from different viewpoints, but for an EE in biology the treatment of the topic must be clearly biological. For example, an EE in an interdisciplinary area such as biochemistry will, if registered under the subject of biology, be judged solely on its biological content.

Disease, for example, could be considered through many different lenses. A biology paper about diseases would focus on their impact on particular organisms or life processes, and not on medical treatment, or the economic effects of the disease on society.

Approaches to research

Primary Research

Essays in biology may be based on data collected by the student through:

Essays that involve lab work, or fieldwork, should include a clear and concise description of the experimental procedure. Students taking an experimental approach must also consult secondary sources.

Secondary Research

Students can base their essays on data or information obtained from literature (secondary studies). However, in this case they should use the data in an original way. Essays that simply restate facts or data taken directly from the sources are of little value.

Biology Sources

Even students doing primary research will still need to reference secondary sources. And students relying entirely on secondary sources will need to find sources not only of written information but also experimental data which they can analyze.

Writing the Essay

An essay in the sciences requires is more than just generating and presenting data. Analysis of the data is also essential. The main body of the essay should consist of an argument or evaluation based on the data or information presented . You can gather your own data through a variety of methods, or rely on secondary data. You should use graphs, tables, or diagrams to point out the significance of your findings.

You should ensure that the main body of the essay is well structured and has an obvious logical progression. You can use numbered and headed paragraphs to impose a clear structure. Your evaluation should show that you understand the the data they have collected and its significance to the world.

In your analysis, you should also describe and explain the limitations imposed on the research by factors such as

• the suitability and reliability of the sources accessed
• accuracy and precision of measuring equipment
• sample size
• validity and reliability of statistics

Students  should also consider biological limitations such as:

• those arising from the problem of repeatability and control when using living material
• the difficulties of generalizing from research based on a single type of organism or environment.

Exceptions for Safety and Academic Honesty

Safety and Ethics in Choosing a Topic

In all cases where human subjects are used as the basis for an investigation, clear evidence of informed consent must be provided in accordance with the IB guidelines.

Some topics may be inadmissible because their means of investigation are unethical. For example, investigations that:

• are based on experiments likely to inflict pain on, or cause stress to, living organisms
• are likely to have a harmful effect on health, eg culturing micro-organisms at or near body temperature (37°C)
• involve access to, or publication of, confidential medical information.

Some topics may be unsuitable because of safety issues. Adequate safety apparatus and qualified supervision is required for experiments involving dangerous substances such as:

• toxic or dangerous chemicals
• carcinogenic substances
• radioactive materials.

Other topics may be unsuitable because the outcome is already well known and documented in standard textbooks.

Assessed Student Work

• The Antimicrobial Effects of Metals Copper, Barium and Silver on the Growth of Bacteria
• Effects of different calcium salts in growth solutions on the growth of the stems of basil (Ocimum basilicum) plants grown hydroponically
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Excellent Extended Essays - Biology

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IB World Studies EE examples

Filter exemplars, exploring the terra and aqua satellites’ contribution and roles in monitoring and controlling wildfires, how have economic factors affected the biological consequences of "the cough syrup incident" in indonesia and how has it shaped the public health and cough syrup industry, want to get full marks for your ee allow us to review it for you 🎯, to what extent did mexico9s power have an effect on covid-19 vaccine access, to what extent are bike lanes in metro vancouver effective, to what extent can mango pits be used as a biomass resource to heal the economic shortage of power supply in india, fast track your coursework with mark schemes moderated by ib examiners. upgrade now 🚀, to what extent has the unified payments interface (upi) positively impacted the indian economy and its political ramifications, to what extent will the people's republic of china's domestic energy mix and consumption be able to contribute to the united nations’ sustainable development goal 7 while maintaining healthy economic growth by 2030, to what extent did the establishment of thomson east coast line (tel) impact the property value of housing around tel and the economy of singapore between 2020 and 2023, how does the epidemiological structure of iron deficiency anaemia among individuals contribute to reduced work productivity, leading to economic losses in agricultural sectors of india, to what extent has the us semiconductor export curb to china, imposed in september-october 2022, impacted the usa and china’s economies, nvidia’s financial performance, and strategy plans, to what extent could small modular reactors be a solution to sustainable energy production in the united kingdom, how does the use of performance-enhancing drugs (peds) in high-level sports events affect an athlete’s health and career what is society’s perception towards doping in sports, to what extent does l’oréal’s investment in biogas as a bioenergy source allow them to maintain economic and environmental sustainability in france, to what extent does the growing threat of ocean acidification impact tourism, analyzing the great barrier reef and areas of queensland, australia that border the great barrier reef, how do psychological factors and neural correlates contribute to radicalization to violence, specifically jihadism, to what extent is there a relationship between food allergies and anxiety in children and adolescents does this relationship have implications for treatment options, to what extent can optimisation of a business allow for sustainable use of resources relating to the fashion industry, to what extent are the national security policies of the usa and pakistan similar or different in the areas of economic security and terrorism, to what extent has the usage of bitcoin and its practices impacted the economy and environment of kazakhstan, to what extent do the government's initiatives of loan moratorium and the wage subsidy programme help the penang’s citizens financial burdens and employment of the tourism industry due to covid-19, what gender discriminatory factors are responsible for the disproportionate rate of hiv infection among adolescent females in the region of sub-sahran africa, how does regulation in road transport engineering—traffic signals specifically—improve or deteriorate traffic safety in the netherlands and the us, to what extent is the impact of lead biomagnification in local food supply on the people in selangor, malaysia, how does the increase in water pollution impact the economic and ecological sustainability of the kolleru lake in andhra pradesh, to what extent will reliance's investment in bioenergy for the production of hydrogen as a biofuel through biomass gasification india influence its capacity to maintain both economic and environmental sustainability, an investigation into the economical and medical pros and cons derived from the growth of human gene editing, to what extent does the outbreak of covid-19 pandemic increase the inequality in the distribution of income within malaysia and what does the malaysian government do to help the lower income people , how did the loss of the gene patent case surrounding the discovery of the brca1 and brca2 by myriad impact the various stakeholders related to brca testing in the us, how do the cognitive biases of a consumer affect their behaviour in tourism flow in bali, to what extent does diet and conformity cause japan's lower obesity rates compared to the usa, environmental and/or economic sustainability: chemistry + ess - to what extent does the incorrect disposal of hexavalent chromium impact platanista gangetica gangetica in the river ganges, and does this pose an immediate threat to humans as well, to what extent did youth unemployment in post recession spain impact youths and what observed youth mental health issues surfaced during the same period, economics + ess: [32/34] “what impact did investment in renewable energy have on gujarat’s environmental sustainability and economic development since 2015”, global politics and economics - a critical analysis on the rana plaza case study: to what extent are worker’s rights and standard labour conditions a priority in the ready-made garments sector of bangladesh, to what extent did the interim budgets implemented by the singapore government aid in the survival of food & beverage businesses during the pandemic in the year 2020, history and english: how have artists’ representations of the french revolution in media responded to transforming individuals and societies from 1789 - 2021, to what extent are genetically modified (gmo) sugarcane crops effective and sustainable in combating the sugarcane borer (diatraea saccharalis) and how do they affect the sugar and ethanol industry of brazil, how does pharmaceutical pollution by the discharge of drugs: diclofenac and propranolol, ecotoxicologically affect blue mussels (mytilus edulis) in himmerfjärden bay, sweden in the baltic proper, to what extent can the increased production of alternative proteins aid in achieving food security and economic growth in singapore, what impact could the establishment of a potato-based biofuel industry have on bangladesh’s environmental and socioeconomic development.

Gr. 11-12 Extended Essay

• Reflections
• Choose a Subject
• Choose a Topic
• Draft a Research Question
• Develop Your Search Strategy

Biology EE Overview

Acceptable source types for biology ees, recommended databases, website sources, ee examples.

• Computer Science
• Visual Arts
• World Studies
• Introduction
• Academic Integrity
• Common Questions
• For Supervisors
• Biology EE Workflow and Expectations

Subject Options

a. Experiment-based essay: The focus with experiment-based essays is the primary data produced as a result of the experiment(s) conducted by students. Secondary sources in the form of scientific publications should be used to support a line of argument or indicate where the student has adapted their approach so as to produce different results. A consideration of the quality of the secondary source should also be offered to identify limitations or weaknesses in approach, method and so forth. Note: there are restrictions placed on the use of animals and humans when it comes to experiment-based essays. Check the IB Policy ‘Guidelines for the use of animals in IB World Schools’.

b. Non-experiment-based essay: Non-experiment-based (literature) essays should effectively question the reliability of the secondary source material used, and offer some insight into the strengths and limitations of the methodological approaches taken by the secondary sources.

Source Options

Source: Lekanides, K. (2016).  Extended Essay Course Companion.  Oxford University Press.

Biology EE Examples

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Extended Essay: Criterion E: Engagement (Reflection)

• Kick Off Day
• Define Topic
• Locate Resources
• Annotated Bibliography
• Evaluating Sources
• Integrating Quotes
• Citations & Referencing
• Evaluation Criteria & Examiner Reports
• Criterion A, B, C: Assessment of Research
• Criterion D: Presentation
• Criterion E: Engagement (Reflection)
• The Viva Voce
• EE Draft Feedback Template for Supervisors
• Language of Analysis
• Approaches to Learning (ATL)
• Roles and Responsibilities

Criterion E: Reflection (6 pts max)

Remember to include discussion of the Approaches to Learning (ATL's) in your reflections. This discussion needs to be specific and well-illustrated with clear examples. For specific language related to each of the ATL's, please click here .

Reflection One- Initial Stage

This will be after one of the early sessions with your supervisor where you outline:

• Your ideas regarding the topic in general
• The research question you have in mind
• Initial background reading or research you may have conducted
• Possible approaches
• Initial thoughts about the answer to your research question
• Roughly 100 words in length

Guiding Questions:

What exactly do you want to find out?

What resources do you plan to use?

What problems do you anticipate in your research?

What writing and research have you done since last session?

Have you found any sources with conflicting viewpoints?

Have you been able to find relevant sources from different eras?

What challenges did you encounter in finding relevant sources?

How do you think you might use your sources?

Have you collected sufficient data?

Have you finished note taking from your text?

• What am I interested in researching and why?
• What are my motivations for undertaking research in this area?
• How will I begin the research process?
• Is my chosen topic appropriate for the subject I have chosen to complete it in?
• Do I have sufficient knowledge of the subject area to fulfill the criteria of an EE?
• What possible question(s) might I research?
• How might I go about undertaking this research?
• Do I have access to appropriate sources?
• Are my chosen research methods appropriate for the subject I have chosen to complete it in?
• Are there any ethical issues I need to consider before pursuing this area of research?
• Is there sufficient focus to my research area?

Examples of Reflection One

• Sample History EE Reflection

I was attracted to Anna Comnena's The Alexiad as a result of some extra readings which formed part of my IB History course (Crusades). As the first female historian, she stands in a unique place in terms of historiography, something which appealed to me as both a woman and budding historian. I was initially considering writing about her accounts of the First Crusade but quickly found the topic to be far too wide in scope. A reading of Paul Magdalino's article "The Pen of the Aunt" helped refocus me on the issue of historical purpose, i.e., why she wrote the history she did. I have now allocated time to reading historical accounts of Manuel I's reign to decide how closely the events Anna mentions in her history of her father's reign (Alexius) so as to validate my current hypothesis-  that Anna intended the work as a celebratory account of her father so as to cast a negative light on the rule of her nephew Manuel I. My current list includes Runciman, France, Macrides, Christomides, and Hill.

Reflection Two- Interim Stage

This reflection session will usually fall somewhere in the middle to latter half of your EE process, usually before the first draft is completed.

• Discuss how the research question has become more refined.
• Comment on any challenges you have encountered & what solutions you have attempted.
• Discuss how your thinking on your topic has evolved.
• Roughly 200 words in length

Where was I? Where I am now? Where am I going?

What sources do you find helpful?

How have you evaluated your sources?

Have you adopted a structure for writing based on what the IB requires?

What do you need to do next?

Examples of Reflection Two

I was finding it hard to come up with a satisfactory counter to the question of accuracy and authenticity which feature prominently in modern readings of her work. Historians ranging from Edward Gibbon and John France to the more direct Howard-Johnson paper which completely challenges her authorship effectively negated my hypothesis entirely. Using Magdalino and Hill as a focus point, I re-read key sections of The Alexiad and mapped out her account against the policital events of Manuel I's reign and quickly discovered some interesting overlaps (building works, military campaigns, relations with the West, etc.). Though occasionally obscure and subtle, the criticisms emerge by means of an unspoken comparison which Byzantine readers of her account would have well understood. This approach is providing me with a suitable counter to the aforementioned criticisms. I have also begun structuring my work accordingly with sections devoted to historical context followed by a section on The Alexiad which compares and contrasts events from Alexius' time with those of Manuel's. I am considering a chapter on the historiographical tradition of Byzantium but may integrate it into the main body in the end.

Reflection Three- Looking Back

This final reflection should be written BEFORE the Viva Voce meeting. It should:

• Offer your final reflections on the process
• Discuss any achievements realized or challenges overcome
• Discuss elements that allowed you to complete the task that may not be readily apparent in the essay itself.
• Discuss any relevant ATL's (Approaches to Learning) that you have developed through the process & be ready to provide good examples.

Guiding Questions

What did you discover that surprised you?

Is writing the EE mainly about process or product AND why?

What would you have done differently and why?

What advice would you give to a student just beginning this process?

What have been the high and low points of the research and writing processes?

What would you have done differently?

What is the most important thing that you learned?

What was your greatest challenge and how did you overcome it?

What would you change if you did another EE?

What was the most valuable experience that you took away from the process?

What was your greatest challenge and what did you do to overcome it?

What IB learner profile attribute would you say helped you through the process (communicator, risk-taker, etc.)?

Would you like to continue reading on this topic?

What questions did this process raise?

What conclusions have you drawn about the topic?

Examples of Reflection Three

I am very pleased with how the essay has turned out. Skills wise, I had no problems with referencing which I picked up quickly though integrating source analysis did prove a challenge at times due to my narrative tendencies. I believe I've been able to challenge the orthodox interpretations of Anna's work as a piece of fantasy fiction at the hands of a disgruntled woman by showing that Anna was effectively using one of the few weapons still permitted her in her diminished political state- the power of words- to criticize the existing leadership. Hill's works proved of particular use to me as they examined female power in a broader context and thus gave me a framework for interpreting what Anna was able to do within the context of her time.

IB-provided exemplars of "Reflections on Planning and Progress"

• Lang. Lit. Examplar #1
• Lang. Lit. Exemplar #2
• Lang. Lit. Exemplar #3
• History Exemplar #1
• History Exemplar #2
• Psychology Exemplar
• Biology Exemplar
• Math Exemplar #1
• Math Exemplar #2
• Visual Arts Exemplar #1
• Visual Arts Exemplar #2
• World Studies Exemplar #1
• World Studies Exemplar #2

Reflection Sentence Starters and Key Words

Click here or on the image below to go to the list of sentence starters you can use to help you write up your reflections. Regarding word count, we recommend 100 words for first reflection, 200 words for second reflection, and 200 words for third reflection (roughly).

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