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Question

How many electrons, protons and photons are involved in the lysis of water to evolve one molecule of oxygen?
  1. 4e, 4H+ and 4 photons
  2. 4e, 4H+ and 8 photons
  3. 2e, 2H+ and 8 photons
  4. 2e, 2H+ and 4 photons


Solution

The correct option is B 4e, 4H+ and 8 photons
Four electrons must be moved through the photosynthetic electron transport pathway to convert two water molecules into one O2 molecule (plus 4 hydrogen ions), and each electron requires two photons (one at each reaction centre) to traverse the pathway. Therefore, the quantum of light required in photosynthesis is 8 photons for one molecule of oxygen to be evolved. 2×2H2O4H++O2+4e

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