By deep freezing,it is possible to preserve embryos at which stage?

The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Make an attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.

Select the correct option with respect to the chromosome number in the sexual life cycle of an apple $(2n = 34)$.

Even in the absence of pollinators,seed-setting is assured in $-$

Self-fertilization is seen in:

In plant $A$,$2n = 12$ and in plant $B$,$2n = 16$. Then the ploidy number (total chromosome number) of the hybrid plant resulting from cross-breeding is: