Question

2. Which of the following gases is fixed into nitrogenous compounds by blue-green algae present in
the soil?
(a) Hydrogen
(b) Nitrogen
(c) Oxygen
(d) Chlorine
​

Answer 1

Answer:

nitrogen

Explanation:

it is because blue green algaes (cyanobacterias) are nitrogen fixing organisms which fixes atmospheric nitrogen into nitrogenous compounds(nitrates)

Answer 2

Nitrogen gases is fixed into nitrogenous compounds by blue-green algae present in the soil.

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