Advanced Science Primary 6 Energy

A plant was placed in a sealed glass jar with adequate water and sunlight. After several hours, the level of carbon dioxide in the jar decreased. This is because __________.

A the glass jar absorbed the carbon dioxide
B the carbon dioxide condensed into water droplets
C the plant used the carbon dioxide for photosynthesis
D the plant used the carbon dioxide for respiration
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Worked Solution

Step 1: Photosynthesis requires light, water, and carbon dioxide. Step [2-9]: In sunlight, the rate of photosynthesis is higher than respiration. Step [2-9]: The plant consumes CO₂ to produce food, leading to a decrease in its level.

Correct answer: the plant used the carbon dioxide for photosynthesis

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