When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
Which of the following statements are correct regarding the sexual reproduction and life cycle of bryophytes? S1: Antherozoids are biflagellate, motile, and are released into water to reach the archegonium. S2: Fertilisation involves the fusion of a male gamete with a single egg, leading to the formation of a diploid zygote within the archegonium. S3: The zygote in bryophytes immediately undergoes meiosis to produce haploid spores, thus completing the life cycle. S4: The sporophyte formed from the zygote is attached to the photosynthetic gametophyte and depends on it for nourishment. S5: Some cells of the sporophyte undergo reduction division to produce haploid spores, which germinate to form new gametophytes.
Correct answer: B — S1, S2, S4 and S5 are correct
The core concept here is the process of sexual reproduction and the life cycle in bryophytes. S1: "The male sex organ is called antheridium. They produce biflagellate antherozoids. The antherozoids are released into water where they come in contact with archegonium." This statement is correct. S2: "An antherozoid fuses with the egg to produce the zygote." This statement is correct, indicating fusion within the archegonium and diploid zygote formation. S3: "Zygotes do not undergo reduction division immediately. They produce a multicellular body called a sporophyte." This statement is incorrect because the zygote first develops into a sporophyte, and meiosis occurs later in the sporophyte. S4: "The sporophyte is not free-living but attached to the photosynthetic gametophyte and derives nourishment from it." This statement is correct. S5: "Some cells of the sporophyte undergo reduction division (meiosis) to produce haploid spores. These spores germinate to produce gametophyte." This statement is correct. Therefore, statements S1, S2, S4, and S5 are correct. The final answer is B because it correctly identifies all the true statements about bryophyte sexual reproduction and life cycle. Option A is incorrect because S3 is false. Option C is incorrect because S3 is false and S5 is correct. Option D is incorrect as it misses S2.
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