Tag: plant kingdom

In Bryophytes, sexual reproduction is oogamous, but the gametes are often described in terms of their fusion. Isogamy is a primitive form where gametes are identical, but Bryophytes generally exhibit more advanced forms.

In many pteridophytes, especially heterosporous ones, the gametophytes are dioecious (separate male and female gametophytes). This is a general characteristic of the group's reproductive strategy.

Answer is option C i.e. "Bryophytes"
The zygote does not undergo meiosis immediately in bryophytes to form the sporophyte (a multi-cellular body). Some cells of the sporophyte undergo meiosis to form haploid spores. Spores further germinate to produce the gametophyte.

Bryophytes are known as amphibians of the plant kingdom because they require water for the movement of male gametes to the archegonia. Option B is wrong because sex organs in bryophytes are multicellular. Option C is wrong because the plant body is a thallus, not differentiated into true roots, stems, or leaves. Option D is wrong because Polytrichum is a moss, not a liverwort.

In pteridophytes, the spore germinates to form a small, inconspicuous, multicellular, free-living, photosynthetic thallus called a prothallus. This structure represents the reduced gametophyte stage of the plant.

The opening of floral buds is a growth-related movement that occurs independently of external stimuli, making it an autonomic movement of growth (specifically a nastic movement).

Statement (A) is wrong because the sporophyte in mosses is more elaborate than in liverworts. Statement (D) is wrong because Pinus is monoecious, meaning male and female cones are borne on the same tree. Statements (B) and (C) are correct.