Biology
General
Easy
Question
Photosystem I (PS-I) and Photosystem-II (PS-II) are named
- (a) In the sequence they work in light reaction
- According to their molecular weight
- (c) In the sequence of their discovery
- (d) In the sequence of their constituents
The correct answer is: (c) In the sequence of their discovery
The pigments are organised into two discrete photochemical Light Harvesting Completes (LHC) within the Photosystem I (PS-I) and Photosystem II (PS-I). These are named in the sequence of their discovery, and not in the sequence in which they function during the light reaction. The LHC are made up of hundreds of pigment molecules bounded to proteins. Each photosystem has all the pigments (except one molecule of chlorophyll-a) forming a light harvesting system known as antenna
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