In which of the following does no net gaseous exchange take place between leaves and the atmosphere?
Correct answer: C. Dawn and Dusk
- A. Day
- B. Night
- C. Dawn and Dusk
- D. Midnight
Explanation
At dawn and dusk, the intensity of light is low. At this moment the amount of oxygen released from photosynthesis is equal to the amount of oxygen used in respiration. Similarly, the amount of carbon dioxide released from respiration is equal to the amount of carbon dioxide produced in photosynthesis. It is called "Compensation Point." Hence, option C is correct.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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