Which one is a nitrogen fixer blue-green algae?

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Ulothrix

Anabaena

Ulva

Hydrodictyon

answer is B.

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Detailed Solution

Concept: Blue-green algae, also known as cyanobacteria, are photosynthetic bacteria seen as single-celled or living as colonies. Green colour pigment called chlorophyll is present in blue-green algae.
Natural territories of blue-green algae are marine and brackish systems. They've been called blue-green algae because they typically look green and gradually turn blue at the time of their death. The utmost of the species show buoyancy, and they float on the face of the water.
Blue-green algae are some major microbes that fix nitrogen in fields, helping food products. Anabaena is a type of blue-green algae with barrel-like cells. They help in nitrogen fixation in paddy fields. Thus, this is the correct option.
Hence, option 2 is the correct answer.

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