What is observed in improved varieties obtained through plant breeding methods?

From which species was resistance against $Phytophthora$ in potato obtained?

In wheat,solid stems lead to non-preference by

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 $1963$,several varieties of wheat such as ........ and ......... were introduced to all over India.

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