Which variety of rice is an example of a naturally occurring mutation?

In wheat,solid stems lead to non-preference by

Hybridisation of plants between two genera of the same family is . . . . . . .

Which is a similar term to $Hybrid$ $vigour$?

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

This step consists of selecting,among the progeny of the hybrids,those plants that have the desired character combination.