Question

Some plants only use PSI and not PSII. What advantage does this arrangement have, and what disadvantage does it have?

Answer 1

Ans: ps1 means uses light energy to convert NADP+ to NADPH2.it involve the p700, chlorophyll pigments.

Ps2 means absorb the light energy involvibg p680 and transfer electrons from water to plastoquinone .

1. Both are protein mediated complexand aim is to produce energy which is used in Calvin cycle.ps1 involves NADP+ to NADPH2 . while ps2 absorb light energy .

2.ps1 located on outer surface of thylakoid membrane and bind to reaction center p700 while ps 2 located in inner surface of thylakoid membrane and reaction center is p680.

3.pigments in ps1 absorb longer wavelength of light which is 700nm on other hand pigments in ps2 absorb shorter wavelength of light which is 680nm.

4.photophosphorylation in ps1is involved in both cyclic as well as in non cyclic photophosphorylation,and ps2 in both cyclic photophosphorylation.

5.No photolysis occurin ps1 though it happens in ps2.

6. Primary function of ps 1 in NADPH synthesis,where it received electrons from ps2 and ps 2 is in the hydrolysis of water and atp synthesis.