Describe the development of embryo sac in angiosperms. Draw labelled diagram of mature embryo sac.

Study the following lists. Match the floral parts given in List - I with the corresponding symbols, in List - II

The correct answer is

The plant parts which consist of two generations one within the other:

(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule

Assertion $\left(\mathrm{A}\right):$ Pollengrains are well preserved as fossils

Reason $\left(\mathrm{R}\right):$ The exine of pollen grains is made up of sporopollenin, which can withstand high temperatures, strong acids and alkali.

Assertion $\left(\mathrm{A}\right):$ Xenogamy involves transfer of pollen grains from the flower of one plant to the stigma of another plant.

Reason $\left(\mathrm{R}\right):$ This is the only type of pollination which brings genetically different types of pollen grains to the stigma.

The correct answer is: