Azolla is used as a biofertiliser because it

Azolla is used as a biofertilizer because it

Which organisms are used to increase thesoil fertility ?

Due to which of the following organism, yield of rice is increased

Assertion : Nitrogen-fixing enzyme in legume root nodules function at low oxygen concentration.

Reason : Low oxygen concentration is provided by leghaemoglobin.

Biofertilizers include