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If there is increase in temperature of about more than \( 35^{0} \mathrm{C} \)

1. Rate of decline of respiration will be earlier than decline of photosynthesis
2. Rate of decline of photosynthesis will be earlier than decline of respiration.
3. Both decline together
4. Both show no fixed variations.

Correct answer: Rate of decline of photosynthesis will be earlier than decline of respiration.

Solution

Photosynthesis is generally more sensitive to temperatures above about 35°C because its enzyme systems and membrane processes are disrupted sooner. Respiration can continue at higher temperatures for longer, so its decline happens later than photosynthesis.

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