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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

In the context of water as a metabolite, its role in photosynthesis involves

A. Being oxidized to O₂ after providing electrons to Photosystem II
✓
B. Absorbing light energy to excite chlorophyll electrons
C. Acting as the final electron acceptor in the electron transport chain
D. Forming a structural scaffold for the thylakoid membrane

📝 Explanation

During the light-dependent reactions, water undergoes photolysis. Water is split (oxidized) by the oxygen-evolving complex, providing replacement electrons to P680 (Photosystem II) and releasing protons (H⁺) and molecular oxygen (O₂) as a byproduct.

📖 Additional Information

  • Being oxidized to O₂ after providing electrons to Photosystem II
  • Absorbing light energy to excite chlorophyll electrons
  • Acting as the final electron acceptor in the electron transport chain
  • Forming a structural scaffold for the thylakoid membrane

During the light-dependent reactions, water undergoes photolysis. Water is split (oxidized) by the oxygen-evolving complex, providing replacement electrons to P680 (Photosystem II) and releasing protons (H⁺) and molecular oxygen (O₂) as a byproduct.

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