Question

Cyclic-photophosphorylation results in the formation of

• A. NADPH + H$^+$
• B. ATP and NADPH + H$^+$
• C. ADP
• D. ATP

Answer 1

Answer: (D)

ATP

Answer 2

In cyclic photophosphorylation, only $PS-I$ takes part and the electrons released from the reaction centre $P_{700}$ return to it after passing through series of carrier. It takes place in stromal lamellae o f the chloroplast which lack $PS II$ and $NADP$ reductase enzyme. The excited electron does not pass on to $NADP^{+}$ but is cycled back to the $PS I$ complex through electron transport chain. Hence, through the cyclic flow only the synthesis o f $ATP$ takes place