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Which pigment acts as the primary photosynthetic pigment and the reaction centre?
AChlorophyll b
BCarotenoid
CChlorophyll a
DXanthophyll
Answer & Solution
Correct answer: C. Chlorophyll a
1. Photosynthetic pigments are split into primary and accessory pigments.
2. The primary pigment traps solar energy and converts it to chemical energy.
3. Chlorophyll a is this primary pigment and acts as the reaction centre.
4. So chlorophyll a is correct.
5. Option A chlorophyll b is an accessory pigment that only relays energy, the trap.
6. Option B carotenoid is also an accessory harvesting pigment, so it is wrong.
7. Option D xanthophyll is a carotenoid type, again only accessory.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Photosynthetic Pigments", p.188_
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