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At a temperature above 35°C,

  • (a) the rate of respiration declines earlier than that of photosynthesis Your answer
  • (b) there is no fixed pattern Your answer
  • (c) both decline simultaneously Your answer
  • (d) the rate of photosynthesis declines earlier than that of respiration Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

At high temperatures (above about 35°C) the enzymes of photosynthesis are affected sooner, so the rate of photosynthesis falls earlier than that of respiration.

Why the other options are wrong

  • (a) · your answer Respiration continues to rise for longer; photosynthesis declines first.
  • (b) · your answer There is a pattern: photosynthesis declines first.
  • (c) · your answer They do not decline together; photosynthesis declines first.
NCERT point: Temperature affects the dark reactions, which are enzyme-controlled.
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