Which of the following groups of plants are highly useful in increasing soil fertility

Symbiotic nitrogen fixation in root nodules of some legumes is caused by

Assertion : Leguminous plants are nitrogen fixers.

Reason : Leguminous plants have Rhizobium in their root nodules.

Which of the following can use molecular nitrogen as nutrient

Which of the following is used as biofertiliser?

$I.$ Cyanobacteria

$II.$ Yeast

$III.$ Symbiotic bacteria

$IV.$ Free living bacteria

Choose the correct option

Which one is a biofertilizer