Question

At a temperature above 35°C

(a) Rate oi 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

Answer 1

Correct option (a) Rate oi photosynthesis will decline earlier than that of respiration

Explanation:

Optimum temperature for photosynthesis is 10° - 25°C for C3-plants and 30° - 45°C for C4 -plants.OPtimum temperature for respiration is 20°C - 30°C i.e. respiration has a higher temperature optimum than photosynthesis and thus declines later.