In mutation breeding,mutations are induced by using chemicals like

Select the mismatched pair with respect to mutated varieties of crops.

Arrange the following steps in the correct sequence for breeding a genetically diverse crop variety:
$I -$ Cross-hybridization among the selected parents
$II -$ Testing, release, and commercialization of new cultivars
$III -$ Selection and testing of superior recombinants
$IV -$ Collection of variability
$V -$ Evaluation and selection of parents

In maize,hybrid vigour is exploited by

What is the use of plants with desired characters?

Which of the following is considered as the root of any breeding program?