The aquatic fern which is an excellent biofertilizer 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

Which of the following acts as a biofertilizer in paddy fields?

Fertility of the soil in rice fields can be improved by

Which of the following microorganisms forms a symbiotic association with plants and helps in their nutrition?

Which of the following is a fertilizer?