The plant parts which consist of two generations - one within the other(i) Pollen grains inside the anther(ii) Germinated pollen grain with two male gametes(iii) Seed inside the fruit(iv) Embryo sac inside the ovule

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

(i) Pollen grains inside the anther: The pollen grain is the male gametophyte generation, and it is contained within the anther, which is part of the sporophyte generation.

(ii) Germinated pollen grain with two male gametes: The germinated pollen grain represents the male gametophyte generation, and the two male gametes it produces are part of the same generation.

(iii) Seed inside the fruit: The seed represents the sporophyte generation, and it is contained within the fruit, which is also part of the sporophyte generation.

(iv) Embryo sac inside the ovule: The embryo sac is the female gametophyte generation, and it is contained within the ovule, which is part of the sporophyte generation.