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Question

If the temperature is increased above 35oC,


A

Rate of decline of respiration will be earlier than that of photosynthesis.

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B

The rate of decline of photosynthesis will be earlier than the decline of respiration.

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C

Both will decline simultaneously.

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D

Both do not show any fixed pattern.

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Solution

The correct option is B

The rate of decline of photosynthesis will be earlier than the decline of respiration.


The correct option is B.

Explanation of the correct option:

  1. The intensity of light, carbon dioxide content, and temperature are all factors that influence photosynthesis.
  2. The rate of photosynthesis is optimum at temperatures ranging from 25oC to 35oC since enzymes stop operating at temperatures around 0oC and get denatured at very high temperatures.
  3. As a result, increasing the temperature over 35oC will result in a decrease in photosynthesis rate owing to the denaturation of carbon-fixing enzymes.
  4. Similarly, at extremely high temperatures, the rate of respiration decreases dramatically.

Final answer: If the temperature is increased above 35oC, the rate of decline of photosynthesis will be earlier than the decline of respiration.


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