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Regarding factors affecting the rate of photosynthesis, which of the following statements is NOT correct?

  • (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance the CO2 fixation rate. Your answer
  • (b) Tomato is a greenhouse crop that can be grown in a CO2-enriched atmosphere for higher yield. Your answer
  • (c) Light saturation for CO2 fixation occurs at 10% of full sunlight. Your answer
  • (d) C3 plants respond to higher temperature with enhanced photosynthesis, while C4 plants have a much lower temperature optimum. Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Statement (d) is wrong: it is C4 plants that respond to higher temperatures with more photosynthesis, while C3 plants have a much lower temperature optimum. The other statements match NCERT.

Why the other options are wrong

  • (a) · your answer Correct: raising CO2 up to about 0.05% increases CO2 fixation.
  • (b) · your answer Correct: tomato and bell pepper are grown in CO2-enriched greenhouses for higher yields.
  • (c) · your answer Correct: light saturation occurs at about 10% of full sunlight.
NCERT point: C4 plants have a higher temperature optimum than C3 plants.
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