Question

Which one of the following is a product of both cyclic and noncyclic photophosphorylation ?

• A. ATP
• B. $O_2$
• C. PSI and PSII both
• D. NADPH

Answer 1

The correct option is A ATP

Phosphorylation is the process of formation ATP from ADP in the light reaction of photosynthesis. It occurs in two ways cyclic and non-cyclic.

The photophosphorylation process which results in the movement of the electrons in a cyclic manner for synthesizing ATP molecules is called cyclic photophosphorylation.

The photophosphorylation process which results in the movement of the electrons in a non-cyclic manner for synthesizing ATP molecules using the energy from excited electrons provided by photosystem II is called non-cyclic photophosphorylation.

Noncyclic photo-phosphorylation involves both PS-I and PS-II while, cyclic photophosphorylation involves only PS-1.

Oxygen is released during noncyclic photophosphorylation by the splitting of water by the process of photolysis.

NADPH is formed during noncyclic photophosphorylation by NADP and H+.

ATP is formed during cyclic and noncyclic photophosphorylation due to concentration gradient across the thylakoid membranes.

So, the correct answer is option C
.