Define the following terms:
$(i)$ Ovule
$(ii)$ Pollination

(N/A) $(i)$ In flowering plants,the megaspore mother cell differentiates from one of the cells of the nucellus. The nucellus is protected by envelopes,and this composite structure is called an ovule.
$(ii)$ Pollen grains,after dispersal from the anthers,are carried by wind or various other agencies to the stigma of a pistil. This process is termed as pollination.