Standard Science Primary 6 Energy

A plant was placed in a dark cupboard for 48 hours before an experiment. What is the main purpose of this step?

A To ensure the leaves are free of starch.
B To prevent the plant from taking in water.
C To stop the plant from breathing.
D To allow the plant to produce more chlorophyll.
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Worked Solution

Step 1: Starch is the stored form of food made during photosynthesis. Step 2: In the dark, the plant uses up its stored starch. Step 3: This ensures any starch found later was produced during the experiment.

Correct answer: To ensure the leaves are free of starch.

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