Biology Experiment Ideas

Science fair projects give you the opportunity to experience biology through practical activities. To make a great biology project it is important that you first understand biology and the logical method. Biology is the study of life. We use the scientific method as a means of studying biology. We can get ideas for biology science fair projects from almost anywhere.

1. Animal Project Ideas

Animal science projects allow us to understand various aspects of animal life. They provide information about animal

science fair projects with dogs

science fair projects with dogs

composition, behaviour and even provide insight into human biological processes. Some science fairs do not allow animal experiments while others have strict regulations for animal practice. Animal projects are important to understanding various biological processes in animals and even humans.

Scientists study animals to learn ways to improve animal health for farm production, wildlife protection and human company.  They also use animals to discover new methods to improve human health. Animal studies give us a better understanding of disease development and prevention for normal and abnormal behavior. The animal project ideas introduce areas of animal studies that can be explored through testing. Animal Project Ideas are the great ideas for projects involving insects, birds, amphibians, fish and mammals.

Amphibian and Fish Project Ideas:

  • Does temperature affect tadpole growth?
  • Does water temperature affect amphibian respiration?
  • Does magnetism affect limb regeneration in newts?
  • Does water temperature affect fish colour?
  • Does the size of a population of fish affect growth?
  • Does music affect fish activity?

Bird Project Ideas:

  • Which types of plants attract hummingbirds?
  • What factors increase egg-laying in birds?
  • Do different bird species prefer a particular colour of bird seed?
  • Do certain bird species prefer to eat in a group or alone?
  • Do certain bird species prefer one type of habitat over another?

Insect Project Ideas:

  • How does temperature affect the growth of butterflies?
  • Do different colours attract or repel insects?
  • How does pollution affect insects?
  • Do magnetic fields affect insects?
  • Does soil acidity affect insects?
  • Does colour affect insect eating habits?

Mammal Project Ideas:

  • Does light variation alter animal sleep habits?
  • Do cats or dogs have better night vision?
  • Does music affect an animal’s mood?
  • Do bird sounds affect cat behaviour?
  • Does animal saliva have antimicrobial properties?
  • Does colour water affect animal drinking habits?

2.  Science Fair Ideas: Zoology

The animal project ideas include projects with insects, crayfish and rodents.

  • What colours are birds attracted to?
  • Digestion and cat food
  • Do turtles recognize colours?

3. Human Body Project Ideas

The body works on the biological processes that keep the body functioning and you should consider a science project on the human body. These projects allow you to gain a better knowledge of how the body functions and also provide close into human behaviour.

1. Behavioral Project Ideas:

  • Does your sense of smell alter your sense of taste?
  • Does music affect blood pressure?
  • Does the weather affect a person’s mood?
  • Does playing video games affect a person’s heart rate?
  • Do colours affect a person’s mood?
  • Does gender affect reaction time?

2. Biological Project Ideas:

  • Does a person’s BMI affect blood pressure?
  • Do all people have the same normal body temperature?
  • Which type of exercises increase muscle growth the most?
  • Does a person’s heart rate and blood pressure vary during the day?
  • Does exercise affect lung capacity?
  • Does blood vessel elasticity affect blood pressure?

4. Plant Project Ideas

Plants are important to life. They provide everything from food, clothing, and shelter to medicine and fuel. Plant projects are popular because plants are rich, cheap, and easy to study during testing. These experiments allow you to learn about plant processes and environmental factors that blow plant life. Plants are extremely important to life on earth. They are the foundation of food chains in almost every ecosystem. Plants also play a major role in the environment by influencing climate and producing life giving oxygen. Plant project allow us to learn about plant biology and potential usage for plants in other fields such as medicine, agriculture, and biotechnology. The following plant project ideas can be explored through experimentation.

  • Do different colours of light affect the direction of plant growth?
  • Do sounds affect plant growth?
  • Do household detergents influence plant growth?
  • Can plants conduct electricity?
  • Does cigarette smoke affect plant growth?
  • Does seed size affect plant height?
  • Do vitamins or fertilizers promote plant growth better?

5. Plant Cell Science Project

This plant project deals with plant cells and plasmolysis. The different salt concentrations affect the cytoplasm of plant cells. Use this project to come up with ideas for your own experiments. The purpose of this sample plant cell science project experiment is to determine how different salt concentrations affect the cytoplasm of plant cells.


Suggested microscopes: Includes slides, cover glasses, dyes, and eye droppers.

  • 2 Graduated Cylinders (100 ml or more)
  • Balance
  • red onion
  • tweezers
  • safety goggles
  • small knife
  • table salt
  • distilled water (grocery store)
  • paper towels
  • spoon
  • paper
  • pencil

1. Gather materials needed for your plant cell science project experiment. Put on safety goggles.

2. Use the knife (ask an adult for support to cut the onion into hold shaped pieces.

3. Use an eye dropper to place a drop of distilled water in the centre of a microscope glide.

4. Use the tweezers to peel a thin layer of skin tissue from the thick part of the onion wedge and place it in the centre of the microscope slide.

5. Add a drop of distilled water and a drop of stain over the onion tissue on the slide.

6. Carefully lower a cover glass slip at an angle over the stained tissue, allowing air bubbles to escape.

7. Examine the prepared slide under the compound microscope at 100X enlargement

8. Prepare a 5% salt solution by adding 5 grams of salt (measure with balance) per 100 ml of     distilled water in a graduated cylinder. Gently shake until dissolved. Also prepare a 10% solution by adding 10 grams of salt per 100 ml of distilled water in another graduated cylinder.

9.  Use a dropper to add a few drops of the 5% solution to one side of the cover slip of our prepared slide. The 5% solution should mix with the fluid already on your onion tissue slide.
10. Carefully slide the triangle shaped end of a paper towel under the opposite end of the cover slip. This will cause the liquid to mix more with the fluid on the slide. Use additional drops of 5% solution as needed to complete the introduction of the new solution.
11. Repeat steps 7 and 8.
12. Use a dropper to add a few drops of the 10% solution to one side of the cover slip of your slide with the 5% solution. The 10% solution should mix with the fluid already on your onion tissue slide.
13. Carefully slide the triangle shaped end of a paper towel under the opposite end of the cover slip. Use additional drops of 10% solution as needed to complete the introduction of the new solution.
14.  Repeat steps 7 and 8 for your plant cell science project.

6. Plant and Soil Chemistry

Plants or soil chemistry are very popular. These projects are great from an educational standpoint because they mix concepts from different areas of science. Some relate botany and chemistry, some have an environmental science slope and others are soil chemistry.

  1. How do different fertilizers affect the way plants grow?
  2. Does using coloured mulch have an effect on a plant?
  3. How do different factors affect seed germination?
  4. How are plants affected by the distance between them?
  5. How are different soils affected by erosion?
  6. How does the pH of soil relate to the pH of the water around the soil?

7.  Experiments with Popcorn

Popcorn is a food that has been around for many thousands of years ever since people in America discovered that if corn was left next to a fire it would pop into fluffy and delicious shapes. Popcorn has become one of the most popular foods on earth with movie-goers everywhere tucking into huge bucketfuls of the material. Experiments with popcorn are a fun way to test a scientific theory with the added bonus of having some tasty food to eat afterwards.

Experiment 1 – Are Yellow or White Kernels the Best?


  • A hot air popper or a pan, a 30 ml oil and a stove
  • A large bowl
  • A tablespoon
  • A large measuring jug
  • Chart for recording your results.


White kernels pop better than yellow kernels.


1. Take white popcorn and heat until you can no longer hear any popping.

2. Let everything cool down and then count the number of popped kernels. Record this on your chart.

3. Tip the popped corn into a measuring jug and measure the volume in ml.

Experiment 2 – Which is the Tastiest Popcorn?

You will be using a ‘blind tasting’ technique to find out which popcorn people like the most.


  • Five different brands of popcorn – it is best to stick to the same type e.g. all salted or all sweet to prevent personal taste becoming an issue.
  • Some popcorn-loving volunteers
  • Five labels, brand A, brand B
  • Five bowls
  • A blindfold


  1. Tip a little of each popcorn into a bowl and make a note, with the labels, of which is which.
  2. Take one of your volunteers and blindfold them in case they recognize any of the brands. You must be very careful and make sure that they cannot trip over anything.
  3. Let them try each brand of popcorn, in turn, and give marks out of ten for how tasty it is.
  4. Make a note of your results in a table and add up the results for each brand of popcorn.
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