Resistance to ........ in bhindi ($Abelmoschus$ $esculentus$) was transferred from a wild species and resulted in a new variety of $A. esculentus$ called ........

In maize,hybrid vigour is exploited by

During the period from $1960$ to $2000$,wheat production increased from .......... to .......... .

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?

Norin-$10$ gene is