A) Photorespiration is a metabolically expensive pathway.
B) Photorespiration is avoided when carbon dioxide is abundant.
C) Photorespiration results in a loss of usable carbon dioxide.
D) All of the above.
Correct Answer: D
Solution :
[d] Photorespiration uses as much ATP as photosynthesis, but results in no energy gains for the plant and has carbon dioxide as a lost by-product. If carbon dioxide is abundantly available, rubisco acts as a carboxylase rather than an oxygenase.
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