At which times there is no net gaseous exchange between leaves and the atmosphere.
Correct answer: C. Dawn & Dusk.
- A. Day time.
- B. Night time.
- C. Dawn & Dusk.
- D. Mid night.
Explanation
At dawn and dusk, light intensity is near the compensation point, so photosynthetic carbon dioxide uptake balances respiratory carbon dioxide release. Students may choose night time because photosynthesis stops then, but respiration continues alone at night and causes a net gaseous exchange.
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