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Question:

In blue-green algae, photosystem-II contains an important pigment concerned with the photolysis of water. It is:

Phycocyanin.

β-carotene.

Cytochrome-c.

Chlorophyll-b.

Solution:

Blue-green algae have the blue-green pigment, phycocyanin that serves as antennae in the photolysis of water at photosystem II and acts as a light harvesting complex along with electron carrier. Chlorophyll b is absent in blue-green algae. So, the correct answer is option A.