Question

Cyclic photo-phosphorylation is carried out by

• A. Both A and B
• B. PS II only
• C. Photolysis and PS II
• D. PS I only

Answer 1

The correct option is D PS I only

Photo-phosphorylation

The process of ATP synthesis by phosphorylation of ADP using the light energy is known as photo-phosphorylation. There are two types of photo-phosphorylation- cyclic and non-cyclic.

• Cyclic photo-phosphorylation only involves photosystem I.
• Non-cyclic photo-phosphorylation involves both PS I and PS II.

Final Answer:

(a) PS I only