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In C3 plants, some O2 binds to RuBisCO and therefore

  • (a) CO2 fixation decreases Correct
  • (b) CO2 fixation increases Your answer
  • (c) more ATP is formed Your answer
  • (d) more 3-PGA is formed Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

In C3 plants, when some O2 binds to RuBisCO, that RuBisCO is not fixing CO2, so CO2 fixation decreases.

Why the other options are wrong

  • (b) · your answer Oxygen binding reduces, not increases, CO2 fixation.
  • (c) · your answer No ATP is formed; ATP is used in photorespiration.
  • (d) · your answer Less 3-PGA is formed, because one PGA is replaced by phosphoglycolate.
NCERT point: This is why photorespiration lowers the yield of C3 plants.
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