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Greenhouse crops such as tomato and bell pepper are grown in an atmosphere enriched with

  • (a) N2 Your answer
  • (b) CO2 Correct
  • (c) O2 Your answer
  • (d) water vapour only Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Tomato and bell pepper are grown in CO2-enriched greenhouses, because extra CO2 increases photosynthesis and yield.

Why the other options are wrong

  • (a) · your answer Nitrogen gas does not increase photosynthesis.
  • (c) · your answer Extra O2 would increase photorespiration, not yield.
  • (d) · your answer Water vapour alone does not raise CO2 fixation.
NCERT point: C3 plants respond to higher CO2 with increased photosynthesis.
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