In $Paramecium$,both autogamy and conjugation are considered sexual processes because of:

Identify the false statement.

Match the following:

Column-$I$	Column-$II$
$(p)$ Intine	$(v)$ Long structure
$(q)$ Exine	$(w)$ Nutrition to pollen grain
$(r)$ Pollen tube	$(x)$ Sporopollenin
$(s)$ Tapetum	$(y)$ Pectin,cellulose
	$(z)$ Glycogen

Choose the correct option for the given statements:
$(i)$ In western countries, a large number of pollen products in the form of syrups are available in the market.
$(ii)$ In rice, pollen grains lose viability within $30$ minutes of their release.
$(iii)$ Pollen grains are stored at $-196^{\circ}C$ (cryopreservation) in liquid nitrogen, not at room temperature, for future use.
$(iv)$ Pollen grains are released from the anther, not from the seeds of wheat and rice.

External fertilization is mostly observed in organisms that.....

How many spore mother cells are required to produce $64$ spores?