The blue-green algae are so called as they have in addition to green pigment chlorophyll, a blue pigment

Phycocyanin

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Chromoplasm

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Cyanophycin

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Phycoerythrin

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Solution

The correct option is A Phycocyanin
Blue-green algae also called as cyanobacteria. They are photoautotrophs which contain chlorophyll a in a specialized organ called thylakoids and phycocyanin and allophycocyanin, that gives them their characteristic blue green color. They make their food with the help of chlorophyll a and sunlight.
Thus, the correct answer is option A.

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