Standard Science Primary 6 Energy

In an experiment, a plant was placed in a sealed container with a carbon dioxide absorber. Why did the plant stop producing starch after some time?

A The temperature was too low for growth.
B It lacked carbon dioxide for photosynthesis.
C It could not take in water.
D It had no light energy.
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Worked Solution

Step 1: Photosynthesis requires light, water, and carbon dioxide. Step [2-9]: A carbon dioxide absorber removes one of the necessary reactants. Step [2-9]: Without CO2, glucose (and thus starch) cannot be produced.

Correct answer: It lacked carbon dioxide for photosynthesis.

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