Which of the following substances were found to be doubled in hybrid varieties of maize?

Match the Column-$I$ with Column-$II$:

Column-$I$	Column-$II$
$(1)$ Pusa Shubhra	$(a)$ Leaf and stripe rust
$(2)$ Pusa Swarnim	$(b)$ Black rot
$(3)$ Pusa Sadabahar	$(c)$ Chilli mosaic virus
$(4)$ Himgiri	$(d)$ White rust

*(Note: Pusa Shubhra is resistant to Black rot, Pusa Swarnim to White rust, Pusa Sadabahar to Chilli mosaic virus, and Himgiri to Leaf and stripe rust.)*

Which variety is used as a donor for improving wheat crops?

Name any five hybrid varieties of crop plants which have been developed in India.

The scientific process by which crop plants are enriched with certain desirable nutrients is called

The variety of flat bean (Lablab bean) is resistant against which of the following pests?