Standard Science Primary 6 Energy

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

A To ensure the plant has no starch in its leaves
B To increase the rate of photosynthesis
C To prevent the plant from taking in water
D To allow the plant to grow taller
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Worked Solution

Step 1: Plants make sugar and store it as starch during photosynthesis. Step [2-9]: Keeping the plant in the dark stops photosynthesis, causing the plant to use up its stored starch. Step [2-9]: This ensures that any starch found later is only from the experiment.

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

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