Which is the oldest breeding method?

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

What are hybrid plants generally like?

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?

Bombay green banana cultivation is the result of

Which widely grown variety of rice,developed by the International Rice Research Institute $(IRRI)$ in Manila,Philippines,helped solve the food crisis in Asia?