Modern farmers can increase the productivity of paddy by up to $50\%$ using . . . . . . .

Identify the correct statements regarding mycorrhiza:
$(1)$ Many members of the genus $Glomus$ form mycorrhiza.
$(2)$ It is responsible for all mineral absorption from the soil.
$(3)$ Such associations show benefits against drought and salinity in plants.
$(4)$ Mycorrhiza is a symbiotic association between fungi and roots of higher plants.

Who is the individual known for his contribution to organic farming,specifically Ramesh Chandra Dagar?

How are microbes useful in biofertilisers?

Select the incorrect option from the following.

Which nitrogen-fixing cyanobacterium also exhibits a symbiotic relationship with Azolla?