Question

Assertion: Tropical plants have a higher optimum temperature for photosynthesis than temperate plants.
Reason : The temperature optimum for photosynthesis of different plants depends on their habitat.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

The optimum temperature is $10^\circ - 25^\circ C$ for $C_3$ plants and $30 - 45^\circ C$ for $C_4$ plants. The temperature optimum for photosynthesis of different plants also depends on habitat that they are adapted to. Tropical plants have a higher temperature optimum than the plants adapted to temperate climates.