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GATE 2023 ES – Question 37

Environmental Microbiology · Microbial Metabolism · 2 marks · Multiple choice

Which statement is NOT correct?

  1. Photophosphorylation synthesizes ATP from ADP and phosphate in light.
  2. ATP synthesis in mitochondria/chloroplasts is phosphorylation.
  3. The Calvin cycle includes carboxylation, reduction and regeneration in C₃/C₄ photosynthetic plants.
  4. C₃ plants have specialized anatomy, greater heat/high-light tolerance and less photorespiration than C₄ plants.

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Correct answer: (D) C₃ plants have specialized anatomy, greater heat/high-light tolerance and less photorespiration than C₄ plants.

Explanation

D assigns the characteristic C₄ adaptations to C₃ plants. C₄ carbon-concentrating mechanisms and associated anatomy generally suppress photorespiration and support high-temperature/high-light performance. The Calvin cycle remains the downstream fixation cycle in both groups. Thus the incorrect statement is **D**.

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