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Water stress affects photosynthesis by

  • (a) increasing chlorophyll content Your answer
  • (b) increasing CO2 inside the leaf Your answer
  • (c) closing stomata and causing wilting Correct
  • (d) increasing leaf surface area Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Water stress closes the stomata, which reduces CO2 entry, and it also causes wilting, which reduces the leaf surface area and metabolic activity.

Why the other options are wrong

  • (a) · your answer Water stress does not increase chlorophyll.
  • (b) · your answer With stomata closed, internal CO2 falls.
  • (d) · your answer Wilting reduces the surface area.
NCERT point: Water affects photosynthesis mainly through its effect on the plant.
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