Answer:
All photosynthetic
organisms contain one or more organic pigments that are capable of absorbing
visible radiations, which will initiate the photochemical reaction of photosynthesis.
Three major classes of pigments found in plants and algae, are the chlorophylls,
the carotenoids and the phycobilins.
Carotenoid and
phycobilins are called accessory pigments since, the quanta (packets of light)
absorbed by these pigments can be transferred to chlorophyll.
The
diversity of light harvesting pigments in alga implies that the common ancestor
was primitive and that no close affinity exist between blue, green, red, brown,
golden brown and green algae, to use their common names.
The characteristic
pigments of different classes are mentioned below
Class
Common Name
Major Pigments
Chlorophyceae Phaeophyceae
Rhodophyceae
Green algae
Brown algae
Red algae
Chlorophyll-a and
chlorophyll-b.
Chlorophyll-a, chlorophyll -c,
Fucoxanthin. Chlorophyll-a, chlorophyll-d. Phycoerythrin.
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