Correct statement is:

The entire collection of all the species of a particular family in a national park, is called germplasm collection.

During conventional breeding it is not necessary that the hybrids do combine the desirable characters, usually only one in few hundred to a thousand crosses shows the desirable combination

Better yielding double dwarf varieties Jaya and Ratna were developed in Taiwan.

The conventional method of breeding for disease resistance is that of polyploidy and mutation.