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

Pollen grain – Gametophytic generation.Anther – Sporophytic generationEmbryo sac – Female gametophyteOvule – Sporophytic generationFruit and seed represent sporophytic generation. Germinated pollen with two male gametes represent gametophytic generation.