Question
Biology Question on Photosynthesis in higher plants
In photosystem-I, the first electron acceptor is
A
An iron-sulphur protein
B
Ferredoxin
C
Cytochrome
D
Plastocyanin
Answer
An iron-sulphur protein
Explanation
Solution
In light reaction of photosynthesis two types of photosystems are involved. PS-I consists of plenty of chlorophyll-a and very less quantity of chlorophyll- h. These pigments absorb light energy and transfer it to the reaction centre - P-700. After absorbing adequate amount of light energy electron gets excited from P-700 molecule and moves to iron-sulphur protein complex, designated as A (Fe-S). It gets reduced after accepting electrons. It later gives these electron to ferredoxin and gets oxidized again.