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Question
Answer the following question.
Why is photolysis of water accompanied with non-cyclic photophosphorylation?
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Solution
- Photolysis of water provides new electrons to Photosystem – II.
- The water molecule is lysed into three components:
a. Protons (H+) which are used as part of reactions that make NADPH.
b. The Second component formed is electrons which replaces the electrons lost by PS-II.
c. The third component is oxygen (O2) which is released into the atmosphere. - Photosystem I sends electrons to reduce NADP+.
- Then, Photosystem II sends replacement electrons to Photosystem I.
- Finally, the photolysis of water replaces the electrons lost by Photosystem II.
- Water is the ultimate source of electrons for photosynthesis.
Therefore, the photolysis of water is accompanied by non – cyclic photophosphorylation.
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