Azolla enriches rice fields with nitrogen due to its association with

A nitrogen­fixing microbe associated withAzolla in rice fields is

Biofertilizers include

Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?

Most famous nitrogen fixing bacterium/biofertilizer is

Assertion : Leguminous plants are nitrogen fixers.

Reason : Leguminous plants have Rhizobium in their root nodules.