Members of which plant family,pollen grains maintain viability for months?

In the gametophytic phase,which of the following occurs?

What is the process called where the pollen tube carries the male gametes to achieve fertilization?

How many meiotic divisions are required to produce $200$ pollen grains?

If the chromosome number in cells of integuments is $10$,then what will be the chromosome number in the synergids,definitive nucleus,and antipodal cells in the embryo sac of an angiospermic ovule?

Match the following:

Column-$I$	Column-$II$
$(1)$ Grasses	$(P)$ Prevent autogamy and geitonogamy
$(2)$ Hydrilla	$(Q)$ Wind pollination
$(3)$ Cleistogamous flower	$(R)$ Water pollination
$(4)$ Papaya	$(S)$ Autogamy