The correct option is (a).
Explanation
Sexual reproduction in flowering plants (angiosperms) involves the formation and fusion of gametes within specialized reproductive structures located in the flower.
- Statement 1 is Correct: The male reproductive organ of a flower is the stamen, which consists of an anther and a filament. The anther produces pollen grains. The pollen grain represents the male gametophyte. The male gametes are formed inside the pollen grain (specifically, the generative cell within the pollen grain divides to form two male gametes).
- Statement 2 is Incorrect: The filament is the stalk that supports the anther; it is part of the male reproductive unit and has no role in housing the female gamete. The female gamete (egg cell) is formed inside the embryo sac, which is located within the ovule. The ovule is contained inside the ovary (the basal part of the pistil).
- Statement 3 is Incorrect: The anther is the site of microsporogenesis (pollen formation). The zygote is the result of fertilization (syngamy), where the male gamete fuses with the female gamete. This process occurs inside the ovule (specifically within the embryo sac), not in the anther.
Key Takeaway: In angiosperms, male gametes are developed within pollen grains (released from the anther), while female gametes are located within the ovules (inside the ovary). Consequently, fertilization and zygote formation take place within the ovule.