Biology Project Ideas for High School Students: 14 Hands-On Projects for SBI3U & SBI4U (2026)

Looking for biology project ideas for high school students that actually match your course? This guide gives you 14 options. They are grouped by microbiology, genetics, ecology, and human physiology. Each one lists materials, an approximate CAD cost, a safety note, and the Ontario course it supports, SBI3U or SBI4U.

Quick Answer: Strong biology project ideas for high school students fall into four groups: microbiology, genetics, ecology, and human physiology. Popular options include yeast fermentation, strawberry DNA extraction, iNaturalist biodiversity surveys, and reaction time testing. Most cost under 30 CAD, use household materials, and match a specific SBI3U or SBI4U curriculum strand. Mississauga students can enter the Peel Region Science Fair on April 10 to 11, 2026, ahead of the Canada-Wide Science Fair in Edmonton this May.

Key Highlights of Biology Project Ideas for High School Students

• 14 project ideas span microbiology, genetics, ecology, and human physiology, each mapped to SBI3U or SBI4U.
• Most projects cost between 0 and 40 CAD in materials, using household or dollar-store items.
• The Peel Region Science Fair 2026 runs April 10 to 11 at the University of Toronto Mississauga, per peelsciencefair.ca.
• The Canada-Wide Science Fair (CWSF) 2026 runs May 23 to 30 in Edmonton, with nearly 400 finalists, according to Youth Science Canada.
• CWSF finalists compete for close to 2 million CAD in prizes and scholarships, according to Youth Science Canada.
• Sanofi Biogenius Canada, a free national biotechnology research competition, has a 2026 project deadline of May 1.
• McMaster University’s Honours Health Sciences Program requires a minimum 90% Grade 12 average including Biology U (SBI4U).

How to Pick the Right Project for Your Course

Start with the course you are actually taking. Do not pick a project just because it sounds impressive. If you take SBI3U, look at Genetic Processes, Diversity of Living Things, or Animal Structure and Function. If you take SBI4U, look at Molecular Genetics, Biochemistry, Metabolic Processes, or Population Dynamics.

A project tied to your course is easier to explain to a teacher or judge. You can also pull background research straight from your own textbook. For a full walkthrough of the SBI3U unit sequence, see USCA Academy’s guide to the Grade 11 biology curriculum.

Microbiology Projects

1. Yeast Fermentation Rate Across Sugar Types

Test how fast yeast produces carbon dioxide when fed glucose, sucrose, or lactose. Use a balloon or gas-collection tube to measure output.

• Materials: Active dry yeast, three sugar types, warm water, small bottles, balloons, a kitchen scale.
• Approximate cost: 10 to 15 CAD.
• Safety: Home-safe. No open flame or hazardous chemicals required.
• Course connection: SBI4U, Metabolic Processes strand (cellular respiration and fermentation).

You can quantify results in minutes using balloon diameter or gas volume. This gives you a clean independent and dependent variable pair for your lab report.

2. Mold Growth on Bread Under Different Storage Conditions

Compare mold growth on bread stored at room temperature, in the fridge, and in a sealed versus open bag.

• Materials: Bread slices, sealable bags, a spray bottle for controlled moisture, a magnifying glass.
• Approximate cost: 5 to 10 CAD.
• Safety: Home-safe if bags stay sealed. Never open a bag once mold appears.
• Course connection: SBI3U, Diversity of Living Things strand (fungi classification and growth conditions).

Photograph daily growth instead of opening the bag. This keeps the project safe and gives you clean visual data for your board.

3. Antibacterial Effectiveness of Household Products

Test how dish soap, hand sanitizer, and diluted vinegar inhibit bacterial growth on agar plates. Use the disc-diffusion method.

• Materials: Pre-poured nutrient agar plates from a school science supplier, cotton swabs, paper discs, household cleaners.
• Approximate cost: 20 to 30 CAD for a small agar plate kit.
• Safety: Needs teacher supervision. Cultures must be handled and disposed of under school lab protocol.
• Course connection: SBI3U and SBI4U crossover, Diversity of Living Things and Biochemistry strands.

Do not run this one at home. Ask your biology teacher to supervise incubation and disposal, since uncontrolled bacterial growth is a real risk.

Genetics Projects

4. Punnett Square Probability Simulation

Use coin flips or dice to simulate monohybrid and dihybrid crosses. Compare your results to the theoretical 3:1 or 9:3:3:1 ratios.

• Materials: Coins or dice, graph paper or spreadsheet software, poster board.
• Approximate cost: 5 to 10 CAD.
• Safety: Fully home-safe.
• Course connection: SBI3U, Genetic Processes strand (Mendelian inheritance and probability).

This project turns an abstract idea into a hands-on statistics exercise. Running 100 or more trials shows judges how observed ratios converge toward theoretical ones.

5. DNA Extraction From Strawberries

Extract visible strands of DNA from strawberries using a soap-and-salt lysis buffer and cold rubbing alcohol.

• Materials: Strawberries, dish soap, table salt, rubbing alcohol, coffee filters, a resealable bag, test tubes.
• Approximate cost: 10 to 15 CAD.
• Safety: Fully home-safe.
• Course connection: SBI3U, Genetic Processes strand, and SBI4U, Molecular Genetics strand.

Strawberries work well because they are octoploid. That means they carry eight copies of each chromosome, so you extract more visible DNA than from a diploid fruit.

6. Genetic Trait Survey and Chi-Square Analysis

Survey classmates or family members for traits like tongue rolling, earlobe attachment, or widow’s peak. Run a chi-square test against expected Mendelian ratios.

• Materials: Printed survey forms, a calculator or spreadsheet, poster board.
• Approximate cost: 5 to 10 CAD.
• Safety: Home-safe. Requires informed consent from anyone you survey.
• Course connection: SBI3U, Genetic Processes strand (population genetics and statistical testing).

This project uses human participants, so it needs consent forms. Youth Science Canada’s ethics policy requires this for any CWSF-affiliated regional fair entry.

7. Fruit Fly Genetic Cross Project

Breed Drosophila melanogaster with known traits like eye colour or wing shape. Record offspring ratios across two generations.

• Materials: A starter fruit fly culture from a biological supply company, fly food medium, vials, a magnifying loupe.
• Approximate cost: 40 to 60 CAD.
• Safety: Needs teacher or school supervision for sourcing, housing, and disposal.
• Course connection: SBI4U, Molecular Genetics strand (dihybrid crosses and gene linkage).

Fruit flies are invertebrates, so they skip the ethics pre-approval vertebrate animals need. You still need school permission to keep a live culture, and the fly life cycle means you should start early.

Ecology Projects

8. iNaturalist Biodiversity Survey

Document every species you can identify in a local park, ravine, or backyard over several weeks. Analyze diversity using a simple species-richness count.

• Materials: A smartphone, the free iNaturalist app, a notebook.
• Approximate cost: 0 to 10 CAD.
• Safety: Home-safe, done outdoors with a parent or in a familiar area.
• Course connection: SBI3U, Diversity of Living Things strand (classification and biodiversity).

iNaturalist is a free citizen-science platform from the California Academy of Sciences and the National Geographic Society. It suggests identifications through image recognition. Observations become “Research Grade” once the community confirms them, so your data can feed real biodiversity records.

9. Water Quality Testing of a Local Creek or Pond

Test pH, dissolved oxygen, turbidity, and nitrate levels at two or three sites along a waterway. Compare results to water quality guidelines.

• Materials: An aquarium or pond water test kit, sample containers, a thermometer, a turbidity tube.
• Approximate cost: 20 to 35 CAD.
• Safety: Needs adult supervision for fieldwork near open water.
• Course connection: SBI4U, Population Dynamics strand (ecosystem health indicators).

Mississauga has several creeks and ponds through the Credit River watershed. Always test with a partner or adult present, and never enter moving water.

10. Decomposition Rate Comparison Study

Bury or bag apple cores, cotton fabric, plastic scraps, and paper in identical soil conditions. Measure mass loss over four to six weeks.

• Materials: Soil, mesh bags or buried containers, a digital kitchen scale, gloves.
• Approximate cost: 15 to 25 CAD.
• Safety: Home-safe. Wear gloves when handling soil and decomposing material.
• Course connection: SBI4U, Population Dynamics strand (nutrient cycling and decomposers).

This project needs a long runway. Start it at least six weeks before your fair date so your mass-loss data is real, not rushed.

11. Urban Light or Noise Effects on Wildlife Activity

Compare insect or bird activity at sites with different levels of artificial light or traffic noise. Use timed observation counts.

• Materials: A notebook, a stopwatch, a free decibel or lux meter app, binoculars.
• Approximate cost: 0 to 15 CAD.
• Safety: Home-safe if done in daylight in familiar areas with a parent nearby.
• Course connection: SBI4U, Population Dynamics strand (human impact on ecosystems).

Pick sites you can revisit at the same time each day. Do this for at least a week so weather does not skew your comparison.

Human Physiology Projects

12. Reaction Time Under Different Conditions

Measure reaction time using a ruler-drop test or a free online reaction timer. Compare results after caffeine, screen use, or exercise.

• Materials: A ruler or free reaction-time website, a stopwatch, a spreadsheet.
• Approximate cost: 0 to 5 CAD.
• Safety: Home-safe. Avoid testing anyone with a caffeine sensitivity or heart condition.
• Course connection: SBI3U, Animal Structure and Function strand (nervous system response).

Run at least 10 trials per condition per participant. This smooths out random variation and gives you a believable average.

13. Heart Rate Variability and Recovery Time After Exercise

Measure resting heart rate, then track recovery time back to baseline after a set exercise like step-ups or jogging in place.

• Materials: A smartphone pulse app or basic heart rate monitor, a stopwatch, a step or stairs.
• Approximate cost: 0 to 40 CAD, depending on whether you already own a fitness tracker.
• Safety: Home-safe for healthy participants. Exclude anyone with a diagnosed heart condition.
• Course connection: SBI4U, Homeostatic Regulation strand (cardiovascular response and recovery).

This project pairs well with a discussion of homeostasis. Recovery time reflects how efficiently the cardiovascular system returns to a stable resting state.

14. Enzyme Activity and Temperature (Catalase Test)

Measure how temperature affects catalase activity. Time how fast potato or liver samples break down hydrogen peroxide into oxygen bubbles.

• Materials: Fresh potato or liver, 3% hydrogen peroxide, test tubes, a thermometer, safety goggles.
• Approximate cost: 10 to 20 CAD.
• Safety: Needs supervision. Hydrogen peroxide can irritate skin and eyes, so wear goggles and gloves.
• Course connection: SBI4U, Biochemistry and Metabolic Processes strands (enzyme kinetics).

Run this one in a school lab if you cannot control water-bath temperature at home. Temperature control is where most students lose marks, so plan it carefully.

Project Comparison Table

Documenting Your Project for the Canada-Wide Science Fair

Plan your documentation from day one, not the week before your fair. Youth Science Canada runs the Canada-Wide Science Fair (CWSF). It offers a free platform called mySTEMspace to help students build and log a project as they go.

For Mississauga students, the regional path starts with the Peel Region Science Fair (PRSF). PRSF 2026 runs April 10 to 11 at the University of Toronto Mississauga campus. It is open to students in grades 7 to 12 at a school in Peel Region, according to peelsciencefair.ca. Award winners at PRSF can go on to represent the region at CWSF.

CWSF 2026 runs May 23 to 30 at the Edmonton EXPO Centre and the University of Alberta. Close to 400 finalists in grades 7 to 12 or Cégep come from more than 100 regional fairs, according to Youth Science Canada. Finalists compete for nearly 2 million CAD in prizes, scholarships, and international opportunities.

If your project leans toward biotechnology, look at Sanofi Biogenius Canada. It is a free national research competition. Students spend about four months working with a mentor, then present posters at regional and national rounds in Toronto. The 2026 project deadline is May 1.

Build in time for ethics pre-approval if your project uses human participants or vertebrate animals. This covers the reaction time survey, heart rate testing, and genetic trait survey above. Youth Science Canada requires informed consent for human research and pre-approval for vertebrate animal research. Fruit flies and most microorganism work skip this step, but always confirm with your school’s fair coordinator.

For a wider range of project ideas outside biology, see USCA Academy’s 100 school project ideas for every grade. If you want the same course-based approach for chemistry, the chemistry project ideas post covers SCH3U and SCH4U.

How a Biology Project Supports Health and Life Sciences Applications

A well-documented biology project gives you more than a course credit. It gives you a concrete example to reference on university supplementary applications, especially for competitive health and life sciences programs.

McMaster University’s Honours Health Sciences Program requires a minimum 90% Grade 12 average in required courses. These include Biology U (SBI4U) and Chemistry U (SCH4U), according to the program’s own admissions FAQ. The program also receives more than 8,000 applications for roughly 240 seats each year. Every applicant needs something beyond grades to stand out.

A science fair project gives you a specific story instead of a vague claim about loving science. Real data collection, an ethics form, or a regional award all count as evidence. This also builds the independent research habit a Grade 12 Independent Study Unit expects.

For a longer-term plan, see USCA Academy’s guide to building a STEM portfolio for university. It explains how a science fair project fits with other extracurriculars and awards.

What to Consider Before You Start

Be honest about the time commitment. Ecology and decomposition projects need weeks of data collection, not a weekend. If your deadline is close, pick a shorter project like the Punnett square simulation or reaction time testing instead.

Budget for the real cost, not the cheapest estimate. Fruit fly cultures, water testing kits, and agar plates can push a project past 40 CAD once you add shipping or a second attempt.

Confirm supervision requirements early. Bacterial cultures, hydrogen peroxide, and live animal work all need a teacher or lab space. Trying to shortcut this step can get a project disqualified from a regional fair.

Plan for ethics paperwork if your project involves people or vertebrate animals. This can take a week or two to process, so start it before you collect any data.

How USCA Academy Supports Biology Project Success

USCA Academy is an Ontario Ministry-inspected private school in Mississauga. It offers SBI3U (Grade 11 Biology) and SBI4U (Grade 12 Biology) both online and in person. These sit within its Grade 11 and Grade 12 course lineup. Class sizes of 5 to 15 students give teachers time to help you connect a project to your actual unit content.

If you want structured help planning a project, USCA Academy’s biology tutoring in Mississauga can help. Its general tutoring program covers lab report writing and statistical analysis too. Students in the college stream can also review the SBI3C college preparation course to see how project expectations differ.

Students in SBI4U often want study strategies alongside a project. USCA’s guide on how to study effectively for SBI4U pairs well with the ISU timeline many students juggle. For judging criteria, see the school’s post on winning science fair projects.

If you are ready to turn one of these ideas into a full project, USCA Academy’s biology teachers can help you scope it. Contact USCA Academy through its Ontario Secondary School Diploma (OSSD) program page. You can also explore SBI3U and SBI4U course options directly to get started.

Frequently Asked Questions