Question

What does Blue Green Algae fix directly from air to enhance fertility of soil?​

Answer 1

Explanation:

Blue-green algae can fix the atmospheric nitrogen because they contain an O2 sensitive enzyme nitrogenase. ... This nitrogen helps in increasing the fertility of the soil and can be used for the growth of the paddy crops. Thus, the correct answer is option B.

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Answer 2

Answer:

Nitrogen.

Explanation:

More specifically, cyanobacteria (blue green algae) fix nitrogen, which is an essential nutrient for supporting plant growth. The cyanobacteria tap the sun's energy captured during photosynthesis to fix nitrogen from the air and turn it into a form which plants can use.