Which of the following is the characteristic of PS-I?
Which of the following is the characteristic of PS-I?
It is active only upto $680 \mathrm{~nm}$ of light.
The reaction centre of PS-I is $\mathrm{P}_{680}$.
PS-I is reduced by the electrons released in photolysis of water.
PS-I is involved in non-cyclic photophosphorylation.
Solution
Photosystem I is located in the nonappressed part of grana thylakoids as well as stroma thylakoids. In this photosystem chlorophyll : carotenoid content is high. Its photocentre is $\mathrm{P}_{700}$. Pigment molecules of PS I absorb at or below 700 $\mathrm{nm}$ wavelenth of light. It receives electrons from photosystem II. Photosystem I is involved in both cyclic and non cyclic photophosphorylation. It is not connected with photolysis of water. Usually it hands over its electron to $\mathrm{NADP}^{+}$.