Azolla enriches rice fields with nitrogen due to its association with

Which of the following is an example of endomycorrhiza?

The yield of a paddy field can be increased by the application of:

Which of the following is a biofertilizer?

An example of endomycorrhiza is

Mycorrhiza is a symbiotic association between which of the following?
$(i)$ Fungi of the genus $Glomus$
$(ii)$ $Rhizobium$
$(iii)$ Root nodules of leguminous plants
$(iv)$ Cyanobacteria
$(v)$ Roots of higher plants
$(vi)$ Paddy fields