The name of $Norman$ $Borlaug$ is associated with ..........

Sonalika and Kalyan Sona are varieties of which plant?

What is observed in improved varieties obtained through plant breeding methods?

Sonalika and Kalyan Sona, which are high-yielding varieties in India, belong to ..........

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 plant source.
$(C)$ The rice variety $IR8$ was developed in the country ........$(iv)$ ........

The germplasm collections are usually maintained at a $A$ temperature in the form of $B$. Here $A$ and $B$ refer to: