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Question

Cyclic photophosphorylation does not produce

A
NADPH2 and ATP
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B
ATP and O2
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C
O2 and NADPH2
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D
All of the above
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Solution

The correct option is D All of the above
In cyclic photophosphorylation PS- I is involved and the excited electron follows a cyclic pathway. ATP is produced during this process, but NADH and oxygen are not produced in the cycle.

Under certain conditions, the photo excited electrons take an alternative path called cyclic electron flow, which uses photosystem I (P700) but not photosystem II (P680). This is called cyclic photophosphorylation. This process produces ATP but it does make not NADPH and O2.

Since, the NADP reductase enzyme is absent in the stroma lamellae. So in the cyclic photophosphorylation NADPH, & O2 does not forms. So it doesn’t produce any of the above combinations.

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