Write any three differences between cyclic and noncyclic photophosphorylation.

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Solution

Cyclic photophosphorylation Noncyclic photophosphorylation
1. It occurs only in photosystem I. 1. It occurs in photosystems I and II.
2. It involves only the synthesis of ATP. 2. It involves the synthesis of ATP and NADPH $_{2}$ .
3. In this process, photolysis of water does not occur. Therefore, oxygen is not produced. 3. In this process, photolysis of water takes place and oxygen is liberated.
4. In this process, electrons move in a closed circle. 4. In this process, electrons do not move in a closed circle.

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Cyclic photophosphorylation	Noncyclic photophosphorylation
1. It occurs only in photosystem I.	1. It occurs in photosystems I and II.
2. It involves only the synthesis of ATP.	2. It involves the synthesis of ATP and NADPH $_{2}$ .
3. In this process, photolysis of water does not occur. Therefore, oxygen is not produced.	3. In this process, photolysis of water takes place and oxygen is liberated.
4. In this process, electrons move in a closed circle.	4. In this process, electrons do not move in a closed circle.