Photosynthesis Question 96

96. $NADP^{+}$is reduced to $NADPH$ in

[1988]

(a) PS I

(b) PS II

(c) Calvin cycle

(d) Noncyclic photophosphorylation

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Answer : d

Hints & Solution

(d) Non cyclic photophosphorylation is not only connected with ATP synthesis but also production of NADPH. It involves two photosystems-PSI and PSII. PSII (680) receives electrons from photolysis of water and transfer it to PSI (700) to form NADPH from $NADP^{+}$. The hydrogen required for reduction comes from breaking of water molecules.