How many times will meiosis take place for the formation of $80$ wheat grains?

Select the correct option for banana.

The life cycle of an angiosperm is given below. What are $P, Q$ and $R$?
$P \quad Q \quad R$

If a stem has $2n = 10$ chromosomes,find out the number of chromosomes in:
$A$ - Endosperm
$B$ - Egg cell
$C$ - Polar nuclei

Match Column-$I$ with Column-$II$ and select the correct option using the codes given below:

Column-$I$	Column-$II$
$(A)$ Pistils fused together	$(1)$ Gametogenesis
$(B)$ Formation of gametes	$(2)$ Monocarpellary
$(C)$ Hyphae of higher Ascomycetes	$(3)$ Syncarpous
$(D)$ Unisexual female flower	$(4)$ Dikaryotic

Choose the correct option for the given statements:
$(i)$ In western countries, a large number of pollen products in the form of tablets and syrups are available in the market.
$(ii)$ In rice and wheat, pollen grains lose viability within $30$ months of their release.
$(iii)$ Pollen grains are stored at room temperature for future use.
$(iv)$ Pollen grains are released from the seeds of wheat and rice.