Select the correct option for Parbhani Kranti.

Consider the following four measures $(1-4)$ that could be taken to successfully grow chickpea in an area where bacterial blight disease is common.
$(1)$ Spray with Bordeaux mixture
$(2)$ Control of the insect vector of the disease pathogen
$(3)$ Use of only disease-free seeds
$(4)$ Use of varieties resistant to the disease
Which two of the above measures can control the disease?

Give two important contributions of Dr. $M$.$S$. Swaminathan.

Which one of the following is an improved variety of maize?

Why does the sawfly not select wheat?

What is the full form of $IARI$?