Which semi-dwarf variety of plant was developed by Nobel laureate Norman $E$. Borlaug?

In the area of plant breeding,it is important not only to preserve the seeds of the variety being cultivated,but also to preserve all its wild relatives. Explain with a suitable example.

Which of the following is not a main step of plant breeding?

What is the correct sequence of steps for plant breeding?

......... often becomes monotonous due to .........

Explain: plant breeding.