Siti placed a plant in a dark room for two days before starting an experiment to test for the presence of starch in its leaves. Why did she do this?
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Worked Solution
Step 1: Starch is the stored form of glucose produced during photosynthesis.
Step [2-9]: In the dark, the plant cannot photosynthesise and must use up its stored starch for energy.
Step [2-9]: This process (destarching) ensures that any starch found later is only from the experiment itself.
Correct answer: To ensure that all existing starch in the leaves is used up.
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