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      Question

      Which of the following statements is/are correct about

      photosynthesis? (A). Liberation of oxygen when green cells are exposed to sun light in presence of suitable acceptor is known as emerson effect (B). Green light is not effective for photosynthesis (C). When COâ‚‚ is added to PEP, the first stable product is oxaloacetate (D). PEP is the primary COâ‚‚ acceptor in Caplants Choose the correct answer from the options given below
      A (A), (B) and (D) only Correct Answer Incorrect Answer
      B (A), (B) and (C) only Correct Answer Incorrect Answer
      C (A), (B), (C) and (D) Correct Answer Incorrect Answer
      D (B), (C) and (D) only Correct Answer Incorrect Answer

      Solution

      (A) Incorrect: The Emerson effect refers to the enhancement of photosynthesis when red and far-red light are used simultaneously, not the liberation of oxygen. (B) True: Green light is less effective for photosynthesis because it is mostly reflected by green leaves. (C) True: In C₄  plants, CO₂  is initially fixed into oxaloacetate by PEP carboxylase. (D) True: PEP (Phosphoenolpyruvate) is the primary CO₂  acceptor in C4 plants.

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