Question

Question No. 20
Light harvesting complexes (LHC) are made up of hundreds of pigment molecules bound to proteins. In LHC, reaction centre is
formed by
(A) A single chlorophyll a molecule
(B) All the pigments except one molecule of chlorophyll a
(C) Carotenoids and xanthophylls
(D) Both A and B​

Answer 1

both A and B

its the answer....

Answer 2

The answer is option A) A single chlorophyll a molecule.

Explanation:

Before explaining the answer please note that this question is only asking about the reaction centre, not LHC.

• The reaction centre consists of a specific chlorophyll a molecule. It absorbs light energy of long wavelength and releases the electron upon absorption of the energy.
• The photosystem-I and photosystem-II has a reaction centre. In PS-I the reaction centre absorption peak is 700nm and PS-I absorption peak is 680nm.
• The reaction centre is surrounded by several light-harvesting molecules called antenna molecules.