A water fern, which is used as a green manure in rice fields is
Salvinia
Mucor
Aspergillus
Azolla
Which of the following can use molecular nitrogen as nutrient
Azolla enriches rice fields with nitrogen due to its association with
What would happen if oxygen availability to activated sludge flocs is reduced ?
Agricultural chemicals include
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