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Assertion (A): The dark reactions of photosynthesis are controlled by temperature.
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Assertion (A): The dark reactions of photosynthesis are controlled by temperature.
Reason (R): Most of these reactions are enzymatic.
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
Both are true and R explains A. The dark reactions (Calvin cycle) are catalysed by enzymes such as RuBisCO, and enzyme activity depends on temperature, so the dark reactions are temperature-controlled.
Why the other options are wrong
- (b) · your answer R is the reason for A: enzymes make the dark reactions sensitive to temperature.
- (c) · your answer R is true: the dark reactions are enzymatic.
- (d) · your answer Both statements are true.
NCERT point: Light reactions are photochemical and less affected by temperature; dark reactions are enzymatic.
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