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The process that makes the major difference between C3 and C4 plants is

  • (a) respiration Your answer
  • (b) Calvin cycle Your answer
  • (c) glycolysis Your answer
  • (d) photorespiration Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Photorespiration is the main difference: C3 plants lose carbon through it, while C4 plants avoid it by concentrating CO2 around RuBisCO.

Why the other options are wrong

  • (a) · your answer Respiration is the same in C3 and C4 plants.
  • (b) · your answer Both C3 and C4 plants use the Calvin cycle.
  • (c) · your answer Glycolysis is the same in both.
NCERT point: C4 plants show no photorespiration, so their productivity is higher.
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