Agricultural chemicals include
Give scientific reasons : The pressure on use of organic farming and biotic fertiliser has been increased.
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
The biofertilizer present in the roots of legumes is
Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium