The plant, which is used for studying hybrid vigour or heterosis is

Which of the following steps in plant breeding is very tedious and time-consuming?

In maize,hybrid vigour is exploited by

What is the foundation of any breeding program?

The hybrids are generally found to be superior to their parents; this is because of:

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