Practice question
Question
Which pigment combination is common to plants and green algae?
Explanation
Photosynthetic pigment composition provides important chemotaxonomic marker clarifying green plant evolution. Land plants and charophyte green algae contain chlorophyll a as primary reaction center pigment plus accessory chlorophyll b broadening absorption peaks in blue and red spectrum, with carotenoids beta-carotene, lutein and other xanthophylls for photoprotection. This specific combination housed in chloroplasts with grana stacks distinguishes Viridiplantae from Rhodophyta possessing chlorophyll a and phycobilins, Phaeophyta and diatoms with chlorophyll a and c plus fucoxanthin. Retention of chlorophyll a plus b supports close kinship.
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