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NEET2026BiologyChapterActual

Assertion : Photorespiration is considered a wasteful process in C₃ plants. Reason : During photorespiration, the oxygenase activity of RuBisCO leads to the formation of two molecules of 3-phosphoglyceric acid (PGA).

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DBoth Assertion and Reason are false.

Correct answer

C. Assertion is true but Reason is false.

Step-by-step solution

Assertion is true because photorespiration does not produce ATP or sugars, but instead consumes ATP and releases CO₂ , making it a wasteful process in C₃ plants. Reason is false because during photorespiration, the oxygenase activity of RuBisCO binds with O₂ and converts RuBP into one molecule of 3-phosphoglyceric acid (PGA) and one molecule of phosphoglycolate. The formation of two molecules of PGA occurs during the normal Calvin cycle (carboxylation), not during photorespiration. Therefore, Assertion is true but

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