Sexual Reproduction in Flowering Plants PYQs

AI-generated explanation. Check against your textbook.

The phrase “two generations - one within the other” refers to a gametophyte (haploid generation) developing inside the sporophyte (diploid) structure. Pollen grains contain the male gametophyte inside the anther, and embryo sac (within the ovule) contains the female gametophyte. Both A (pollen grains inside the anther) and D (embryo sac inside the ovule) represent the gametophytic generation inside the sporophytic tissue, as described in NCERT. B is about a germinated pollen grain producing two male gametes, which is about development inside a pollen tube, not a separate generation within a structure. C (seed inside the fruit) involves a sporophyte embryo inside a seed, not a separate gametophyte generation within another structure.

In angiosperms, the flowering plant body (sporophyte) surrounds the gametophytes found inside the pollen grain and the ovule.

Gametophyte generation is found inside the sporophyte in both pollen grain and embryo sac.

AI-generated explanation. Check against your textbook.

The incorrect statement is 1. In NCERT, the embryo sac (female gametophyte) develops inside the ovule after megasporogenesis; the ovule itself does not become the embryo sac. The ovary, after fertilization, develops into fruit; the zygote develops into embryo; and the central cell with polar nuclei fertilizes to form endosperm. Thus, 2, 3, and 4 are true statements.

The embryo sac forms within the ovule and later participates in double fertilization with the sperm, leading to embryo and endosperm formation.

The ovary develops into fruit; the ovule contains the embryo sac; the zygote forms the embryo; the central cell forms endosperm.

AI-generated explanation. Check against your textbook.

Parthenogenesis is the development of an embryo from the female gamete without fertilization. In some plants, the female gamete can develop into an embryo without a sperm cell, which is why option 1 is correct.

Syngamy is the fusion of male and female gametes. Parthenocarpy refers to fruit development without fertilization. Autogamy is self-fertilization within a flower.

Parthenogenesis is the development of the female gamete into an embryo without fertilization.

AI-generated explanation. Check against your textbook.

The correct set is B, C, D and E. Vallisneria (an aquatic hydrophyte) has underwater flowers and is not known for colorful flowers with nectar; water-lily flowers are typically pollinated by insects or wind and are not pollinated by water. In water-pollinated species, pollen grains are adapted to resist wetting (C). Some hydrophytes have pollen that is long and ribbon-like (D). In some hydrophytes, pollen can be carried passively within water (E). Thus A is incorrect, while B, C, D and E are correct, matching option 1.

Hydrophytes often rely on water for pollination, and their pollen shows adaptations to aquatic life to avoid premature wetting and to float or move with water currents.

In hydrophytes, pollen/pollination adaptations include protection from wetting and water-mediated pollen movement, not reliance on insects or wind unless adapted for that method.