What is the full form of $IRRI$?

$A$ cross involving two different genera is called

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?

High levels of aspartic acid,low nitrogen and sugar content in maize plants prevent the attack by . . . . . . .

The best way to increase the yield of wheat in India is:

What is Triticale?