NEET BIOLOGY

Detailed explanation-1: -Meiosis occur in the sporocytes and produce simultaneous types tetrads, each one giving rise four trilete spores, with foveolate ornamentation.

Detailed explanation-2: -Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes. The diploid sporophyte results from the fusion of two gametes.

Detailed explanation-3: -The plant bearing strobilus is the sporophytic phase of the life cycle. Strobilus bears spirally arranged sporophylls with sporangium which produces numerous spores. The spores come out from the sporangium and germinate in the soil to form a small top shaped prothallus. This is the gametophytic phase of the life cycle.

Detailed explanation-4: -Haploid organisms don’t undergo meiosis except in the zygote stage. The zygote, being diploid, undergoes meiosis to give rise to the haploid thallus/ body.