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A green leaf has optimal light and CO2 but the temperature is very low. According to Blackman's law, the rate of photosynthesis is limited by

  • (a) light Your answer
  • (b) CO2 Your answer
  • (c) chlorophyll Your answer
  • (d) temperature Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Light and CO2 are optimal, so the factor nearest its minimum is temperature. Low temperature slows the enzymes, so temperature limits the rate.

Why the other options are wrong

  • (a) · your answer Light is optimal, so it is not limiting.
  • (b) · your answer CO2 is optimal, so it is not limiting.
  • (c) · your answer Chlorophyll is present; the problem is temperature.
NCERT point: The limiting factor is the one in shortest supply.
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