Cyclic photophosphorylation

Non-cyclic photophosphorylation

1. The electron recycles back to the system.

1. The electron doesn’t recycle back into the system.

2. Only PSI is involved.

2. Both PSI and PSII are involved.

3. Water is not used for photolysis.

3. Water is used for photolysis.

4. The electrons and protons are used to produce two ATP molecules without NADPH_2.

4. The electrons and protons are used to produce a single ATP and one molecule of NADPH_2.

5. It produces low energy.

5. It produces more energy hence efficient.

6. There is a single primary acceptor of electrons.

6. There are two primary acceptors of electrons.

7. The terminal electron acceptor is PSI.

7. The terminal electron acceptor is NADP, which accepts protons also.

8.It is common in bacteria, lower algae, etc.

8. It is commonly present in higher plants including cyanobacteria.