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Botany Science Fair Project

Photosynthesis: Lights Out!

Photosynthesis: Lights Out! | Science Fair Projects | STEM Projects
Plants need sunlight to survive, but what happens when they don't get enough? In this experiment, you'll cover part of a plant's leaves with shapes and observe the effects of a lack of sunlight.


The hypothesis is that without enough sunlight, plants cannot use the process of photosynthesis to produce food.

Method & Materials

You will pick a shrub, tree or houseplant, cut out some geometrical shapes, paperclip each shape on a different leaf, and observe the effects after four days.
You will need a small shrub, tree or house plant, cardboard or aluminum foil, scissors, and paper clips.


The results of this experiment show that without enough sunlight, plants cannot use the process of photosynthesis to produce food. The leaves that were covered with shapes showed a lack of growth compared to the other parts of the leaf.

Why do this project?

This science project is interesting because it shows how plants need sunlight to survive and how a lack of sunlight can affect their growth.

Also Consider

Experiment variations to consider include changing the shapes used to cover the leaves, changing the amount of time the shapes are left on the leaves, and using different types of plants.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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