What is photophosphorylation?

What is meant by photophosphorylation?Discuss the cyclic photophosphorylation with the help of schematic sketches.

Complete the flow chart for cyclic photophosphorylation of the photosystem-I.

How does oxidative phosphorylation differ from photophosphorylation?Explain.

Note the relationship between the first two words and then fill the suitble word for fourth place: Cyclic photophosphorylation :PS I :: Non-cyclic photosposphorylation:....... .

What is the modulation ? What is need for modulation?