Advanced Science Primary 6 Energy

A plant was kept in the dark for 48 hours before an experiment. What was the purpose of this?

A To stop the plant from absorbing water
B To kill any pests on the leaves
C To allow the plant to grow faster
D To ensure the plant has no starch left in its leaves
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Worked Solution

Step 1: Plants store excess food as starch. Step 2: Keeping it in the dark prevents photosynthesis. Step 3: The plant uses up its stored starch for energy. Step 4: This ensures any starch found later is only from the experiment.

Correct answer: To ensure the plant has no starch left in its leaves

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