Standard Science Primary 6 Energy

In an experiment, a plant was kept in a dark room for 48 hours. Why was this done?

A To allow the plant to grow faster.
B To stop the plant from respiring.
C To ensure the plant uses up its stored starch.
D To make the leaves turn yellow.
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Worked Solution

Step 1: Starch is the stored form of food in plants. Step [2-9]: Keeping it in the dark prevents photosynthesis. Step [2-9]: This forces the plant to use up existing starch so new starch can be tested later.

Correct answer: To ensure the plant uses up its stored starch.

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