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NDA 2023 GAT · General Knowledge · Plant Physiology · medium

During the light reaction of photosynthesis, the oxygen released comes from

Single correct option

During the light reaction of photosynthesis, the oxygen released comes from
  1. A. Carbon dioxide
  2. B. Glucose
  3. C. Splitting of water
  4. D. Chlorophyll
Show answer and solution

Answer: (C) Splitting of water

Water molecules are split (photolysis) in photosystem II, releasing O2, protons and electrons. Carbon dioxide is fixed into glucose in the dark reaction, and its oxygen ends up in sugar and water, not in the released gas.
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Original question written in the NDA 2023 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake