If a breeder wants to introduce a disease-resistant strain,what should be the first step?

Fill in the blanks in the following statements ($A$ to $C$):
$(A)$ The capacity to generate a whole plant from any cell/explant is called ......$(i)$ .......
$(B)$ The transfer of resistance genes occurs through ........$(ii)$ ........ . Subsequently,......$(iii)$ ....... occurs between the target and the source plant.
$(C)$ The rice variety $IR8$ was developed in the country ........$(iv)$ .

In crop improvement programs,haploid varieties are important because they .

Which method is used to obtain all the cultivated varieties of sugarcane?

"Jaya" and "Ratna" developed for the Green Revolution in India are varieties of

Regarding mass selection,which statement is most suitable?