Standard Science Primary 6 Energy

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

A To increase the rate of photosynthesis later
B To kill any pests on the leaves
C To ensure the plant has no starch in its leaves
D To allow the plant to respire
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Worked Solution

Step 1: Experiments on photosynthesis often test for the production of starch. Step [2-9]: Destarching ensures that any starch found later was produced during the experiment. Step [2-9]: Darkness prevents new starch from being made.

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

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