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Differentiate between photosystem I and II.
Answer

PS I

PS II

1. The system is located in both the non-appressed part of grana thylakoids as well as stroma thylakoids.

1. Photosystem II is present in the appressed part of grana thylakoids.

2. Its photocentre is P700.

2. Its photocentre is P680.

3. Has an absorption peak at wavelength of 700nm. 

3. Has an absorption peak at the wavelength of 680nm.

4. It receives electrons from photosystem II.

4. Electrons are received from photolytic reaction.

5. Molecular oxygen is not evolved in this system.

5. Molecular oxygen is evolved by break down of water.