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Which of the following is not true about photosynthesis?

1. In non-cyclic photophosphorylation, water is split and oxygen is released
2. Photosystem-II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation
3. Cyclic system is used when there is insufficient \( N A D P^{+} \) present to absorb electrons in plant cells
4. More carbohydrate is produced during cyclic photophosphorylation than during non-cyclic photophosphorylation

Correct answer: More carbohydrate is produced during cyclic photophosphorylation than during non-cyclic photophosphorylation

Solution

Cyclic photophosphorylation produces ATP but no NADPH and no oxygen, so it cannot drive carbohydrate formation as effectively as non-cyclic photophosphorylation. Non-cyclic photophosphorylation provides both ATP and NADPH, which are needed for carbon fixation and sugar production.

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