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Photosynthesis in Higher Plants
Accessory Pigments
1 question from 1 paper, each with its answer.
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Concepts tested
- Absorption by carotenoids
All Questions
2003 AIPMT 1 question
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Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants : -Carotenoids (carotenes and xanthophylls) are yellow, orange and red accessory pigments.
They absorb light mainly in the violet-blue part of the spectrum (about 400–500 nm) and reflect yellow-orange light, which gives them their colour.
They pass the absorbed energy to chlorophyll a and also protect chlorophyll from photo-oxidation.
They do not absorb red light (absorbed by chlorophylls) or green light (reflected by plants).
So carotenoids primarily absorb the violet and blue fractions.