Question

Write any six differences between cyclic photophosphorylation and non-cyclic photophosphorylation.

Answer 1

Hint: The photosynthesis is the process in which sunlight is used for the preparation of food of the plant. In this process chlorophyll is being used by the plant for the process. This is a complex phenomenon that is carried out through many different stages.

Complete Answer:
- Photophosphorylation is the process of utilizing light energy to form ADP to ATP from photosynthesis.
- It is the phenomenon of synthesizing energy dependent ATP molecules through transferring the phosphate group to ADP molecules in presence of sunlight.
- It is divided into cyclic photophosphorylation and non-cyclic photophosphorylation.
Six difference between cyclic photophosphorylation and non-cyclic photophosphorylation:

Sl.No	Cyclic phosphorylation	Non-cyclic photophosphorylation
1.	Cyclic photophosphorylation occurs in photosystem I.	Non-cyclic photophosphorylation occurs in photosystem I and photosystem II both.
2.	In cyclic photophosphorylation, only ATP is produced.	In non-cyclic photophosphorylation, ATP and NADPH both are produced.
3.	In cyclic photophosphorylation, electrons expelled by the photosystem and return back.	In non-cyclic photophosphorylation, electrons expelled by the photosystem do not come back.
4.	In this reaction photolysis of water molecules does not occur.	In this reaction, water molecules get photolysation.
5.	In this reaction, oxygen is not released.	In this reaction, oxygen is released.
6.	In this reaction, water is not consumed.	In this reaction, water is consumed.

Note: The dark reaction is the second step of the photosynthesis that utilizes the energy from ATP and NADPH to produce glucose. This reaction takes place in the absence of sunlight, it is termed as a biochemical phase. It takes place in the stroma of the chloroplast. In this reaction, glucose is produced by using carbon-dioxide in the dark reaction.