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A C3 crop grown in a sealed glasshouse on a sunny day shows a midday fall in photosynthesis. The most likely limiting factor is

  • (a) light Your answer
  • (b) CO2 Correct
  • (c) chlorophyll Your answer
  • (d) O2 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

In a sealed glasshouse on a sunny day, the crop uses up the CO2 and it is not replaced, so CO2 becomes the limiting factor by midday.

Why the other options are wrong

  • (a) · your answer Light is plentiful on a sunny day.
  • (c) · your answer Chlorophyll does not run out at midday.
  • (d) · your answer O2 is a product, not a limiting factor.
NCERT point: This is why greenhouses are enriched with CO2.
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