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Question
Differentiate between cyclic and non-cyclic photophosphorylation.
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Solution
| Cyclic photophosphorylation | Non-cyclic photophosphorylation | |
| 1. | Only Photosystem I is involved. | Both photosystems I and II are involved. |
| 2. | The electron given out by PS-I returns. | The electron given out by PS-II does return to it, but is used up by PS-I. |
| 3. | It is not associated with the photolysis of water, and so, oxygen is not liberated. | It is associated with the photolysis of water and the liberation of oxygen. |
| 4. | It involves only ATP synthesis. | It involves ATP synthesis and production of NADPH2. |
| 5. | It takes place under low light intensity, anaerobic conditions, or when CO2 availability is less. | It takes place under optimum light, aerobic conditions and the presence of CO2. |
| 6. | It does not participate in photosynthesis except in some bacteria and C4 plants. | It is concerned with CO2 fixation in all plants. |
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