The full form of $IRRI$ is ...........

Clonal selection technique is not useful for

Plants having similar genotypes produced by plant breeding are called:

Which of the following statements is consistent with obtaining a progeny with genetic variation?

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?

Several South Indian states raise $2-3$ crops of rice annually. The agronomic feature that makes this possible is