PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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chlorophyll b
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accessory pigments
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chlorophyll a and accessory pigments
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jelly-like substance
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Detailed explanation-1: -Each photosystem has a critical pigment for photosynthesis (called chlorophyll a) and accessory pigments, e.g., chlorophyll b and carotenoids. The critical chlorophyll a pigment is designated P700 for PSI and P680 for PSII, indicating the light wavelength that is absorbed most efficiently by these pigments.
Detailed explanation-2: -Both photosystems contain chlorophyll a, chlorophyll b and the four carotenoids, but in different proportions. Each unit of PS–1 or PS–2 contains 200 light-harvesting chlorophylls and one reaction centre.
Detailed explanation-3: -Thylakoids are membrane-bound and have several compartment-like structures inside them. The membranes of thylakoid contain chlorophyll pigments and are found in packets called quantasomes. Each quantasome consists of about 250 chlorophyll molecules.