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Which reactions of photosynthesis are most affected by temperature?

(a) the dark (enzymatic) reactions Correct
(b) excitation of P₇₀₀ Your answer
(c) the light reactions Your answer
(d) absorption of light by pigments Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

The dark reactions are enzymatic, so they are most affected by temperature.

Why the other options are wrong

(b) · your answer Excitation of P700 is photochemical and not much affected by temperature.
(c) · your answer The light reactions are less temperature-sensitive.
(d) · your answer Light absorption by pigments is a physical process, not much affected by temperature.

NCERT point: Enzyme activity depends strongly on temperature.

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