Some blue green algae can be used as biofertilizer as they are

Options

(a) Photosynthetic
(b) Surrounded by mucilage
(c) Growing every where
(d) Capable of fixing nitrogen

Correct Answer:

Capable of fixing nitrogen

Explanation:

Blue-green algae cultured in specific media. Blue-green algae can be helpful in agriculture as they have the capability to fix atmospheric nitrogen to soil. This nitrogen is helpful to the crops. Blue-green algae is used it as a bio-fertilizer.