Advanced Science Primary 6 Energy

Siti placed a plant in a dark cupboard for 48 hours before starting an experiment on photosynthesis. What was the purpose of this?

A To allow the plant to respire faster
B To increase the amount of chlorophyll in the leaves
C To ensure the plant has no starch left in its leaves
D To prevent the plant from taking in water
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Worked Solution

Step 1: Plants use up stored starch for energy when they cannot photosynthesise. Step [2-9]: By keeping it in the dark, the plant uses up existing starch. Step [2-9]: This "de-starching" ensures any starch found later is from the new experiment.

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

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