Question

At a temperature above ${35}^{0}C$

• 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

Answer 1

The correct option is A rate of photosynthesis will decline earlier than that of respiration

At temperatures above 35${}^o$C the enzymes responsible for photosynthesis will lose their shape and hence their functionality. As a result the rate of photosynthesis will start declining. Due to the decline in the rate of photosynthesis, the amount of glucose produced will also decline. As a result the rate of respiration will also start to decrese slowly. But the rate of photosynthesis will decrease much earlier.

So, the correct option is 'rate of photosynthesis will decline earlier than that of respiration'.