Advanced Science Primary 6 Energy

A plant was placed in a sealed glass jar under the sun. After 24 hours, the amount of oxygen in the jar increased. Which process was occurring at a faster rate during the day?

A Photosynthesis
B Respiration
C Decomposition
D Transpiration
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Worked Solution

Step 1: Both respiration and photosynthesis occur in plants during the day. Step [2-9]: Respiration uses oxygen, while photosynthesis produces oxygen. Step [2-9]: An increase in oxygen indicates that the rate of photosynthesis exceeded the rate of respiration.

Correct answer: Photosynthesis

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