$(a)$ In both plants and animal, have three phases during their life cycle.

$(b)$ In plant and animal, hormones are responsible for the transitions between the three phase.

$A-$ Events after the formation of zygote are called post fertilization events

$R -$ In viviparous animals a young one develops out side the mother body

After culturing the anther of a plant, a few diploid plants were found along with haploid plants. The diploid plants could have arisen from

In which of the following meiosis does not seen?

Identify $X$ and $Y$ in given figure