Ninth Grade Biology Science Fair Project Ideas


To cap off a year of learning biology, science teachers often opt to hold an exhibition at which students display experiments they have created and tested. For those participating, take the first step of choosing your project for a biology fair. These ideas revolve around the various areas covered by biology: botany, animal life, microbiology and anatomy. Once you have your biology science fair project idea clear in your mind, begin to create an experiment to test it.

Animal Behavior

  • Choose a hypothesis about animal behavior and study the actions of animals in your area. For instance, you might think that your pet dog prefers a certain type of dog food to another. Create an experiment that presents your dog with different types (dry and wet) and brands of dog food. Watch your dog to see which one he prefers. If you do not have pets, lay out bird seed and observe the types of birds which come to feed. Change the bird seed and make your observations to see if the types of wild birds that come to feed differ.

Plant Growth and Music

  • Plant two identical plants in separate planters. Keep all factors the same: light, watering and plant food. Take one plant and apply a variable to it such as taking that plant to another room to talk to it, or place it next to a radio for the plant to "listen" to music. Do not keep the plant in the same room with the control plant, which could become exposed to the variable (talking or music). Make measurement observations daily to observe the growth and the rate of growth to determine whether talking to a plant or playing music for it had a role in its growth.


  • Observe prepared slides of plant and animal cells under a microscope and create a chart of the similarities and differences between the cells. Find out the names of the cell organelles that plant cells have but animal cells lack. Present your findings on a poster board with a Venn diagram consisting of two slightly overlapping circles. Write the similarities between the cells in the intersecting area of the two circles and the differences in the outer portions of the circles.

Taste and Smell

  • Experiment with taste and smell by having blindfolded participants taste strongly flavored items such as a sugar cube, cooked meat, aged cheese, pickles and hot peppers. As the participant tastes each item, have him hold his nose to keep from smelling the item. Ask the participant to record what she thought she tasted on a chart. Repeat with three other people to verify your results and present your findings of whether being able to smell determined how accurately the participants could guess what they tasted.

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  • Photo Credit Birds of a Feather image by Alphaba from pots & plants image by FotoWorx from microscope image by guy from smell image by Connfetti from
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