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NEET 2016 Phase 2 · BiologyPrevious Year Question

The process which makes major difference between C3 and C4 plants is

Answer: (C) Photorespiration. NCERT explicitly identifies photorespiration as the process that creates an important difference between C3 and C4 plants: it occurs in C3 plants (where O2 binds RuBisCO) but does not occur in C4 plants because their CO2-concentrating mechanism keeps RuBisCO carboxylating.

  1. A.Glycolysis
  2. B.Calvin cycle
  3. C.Photorespiration✓
  4. D.Respiration

Correct Answer

(C) Photorespiration

Solution & Explanation

NCERT explicitly identifies photorespiration as the process that creates an important difference between C3 and C4 plants: it occurs in C3 plants (where O2 binds RuBisCO) but does not occur in C4 plants because their CO2-concentrating mechanism keeps RuBisCO carboxylating. The Calvin cycle (B) operates in both C3 and C4 plants, so it cannot be the distinguishing process. Hence the answer is photorespiration (C). NCERT: Class 11 Ch 11, p.147 [147:012–147:013]: "difference between C3 and C4 plants – Photorespiration."

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