Azolla possesses symbiotic association with
Anabaena
Nostoc
Azospirillum
Rhizobium
In paddy fields, _______ serves as an important biofertiliser
Which of the following groups of plants are highly useful in increasing soil fertility
A water fern, which is used as a green manure in rice fields is
$VAM$ represents
Identify correct option for micorrhiza
$(1)$ Many members of the genus glomusinvolved micorrhiza
$(2)$ It is responsible for all mineralsabsorption from the soil
$(3)$ Such associations show benefitsagainst draught and salinity in plants
$(4)$ Micorrhiza is a symbiotic relation ofalgae and plants