My aim is to find out if light is needed for photosynthesis.

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Photosynthesis Experiment

Aim: My aim is to find out if light is needed for photosynthesis.

Introduction: Photosynthesis is needed for a plant to grow and to

stay alive. When photosynthesis occurs the plant makes a substance

called starch which gives the plant energy. You can tell if a plant has

been photosynthesising when it produces starch.

Method:

This test must be done using a control with which to compare the

result. The control plant must be given everything it needs, including
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factors we are investigating.

. Remove all of the starch from the plant's leaves. This process is

called de-starching and it is done by putting the whole plant in the

dark for three days or more. This is important because your results

will all be the same if you don't.

2. Double check that there is no starch left in the plant by doing an

iodine test on its leaves. If the leaf goes blue or black (or any other

dark colour) then there is starch ...

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