Respiration in PlantsHard

Question

At a temperature above 35oC

Options

A.rate of photosynthesis will decline earlier than that of respiration
B.rate of respiration will decline earlier than that of photosynthesis
C.there is no fixed pattern
D.both decline simultaneously

Solution

Optimum temperature for photosynthesis 10oC - 25oC for C3 -plants and 30o - 45o C for C4 - plants. Optimum temperature for respiration is 20oC - 35oC, ie, respiration has a higher temperature optimum than photosynthesis and thus declines later.

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