Question

What is light harvesting complex? What are the different types of photo systems?

Answer 1

A light harvesting complex has a complex of sub-unit proteins that maybe part of a larger super-complex of a photo system, the functional unit in photosynthesis. 
The different types of photo systems are-
Photosystems I (P700) and photosystems II (P680).

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Answer 2

NCERT based Answer for Class 11 Biology Students

Light harvesting system in plants:

 The accessory pigments and reaction center (chlorophyll a), together form photosystem (PS) or Light harvesting complexes (LHC).

 There are two types of photosystem: PS I and PS II.

 In PS I, chlorophyll a has absorption peak at 700 nm, hence is called P700.

 In PS II, chlorophyll a has absorption maxima at 680 nm and is called P680.

Note: These are named in sequence of their discovery and not in sequence in which they function during light reaction.

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