Question

Cyclic photophosphorylation will not occur without:

• A. H${}_2$O
• B. Photosystem-II
• C. Chlorophyll a
• D. NADP${}^{+}$

Answer 1

The correct option is C Chlorophyll a

Cyclic photophosphorylation is performed by photosystem-I independently. There is no need of H${}_2$O as external source of electrons. Reaction centre in PS-I is chlorophyll a which has an absorption peak at 700 nm.