EVERYDAY SCIENCE

Detailed explanation-1: -In some plants like algae, meiosis occurs at the time of formation of spores where the spores are formed from the zygote and spore mother cells. In such plants, gametes are formed by the mitosis. They fuse to form a diploid zygote which undergoes the meiosis to form haploid spores.

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.

Detailed explanation-3: -Spores are produced by mitosis in spore mother cells present in sporangia in pteridophytes.

Detailed explanation-4: -Answer and Explanation: In bryophytes, meiosis occurs in the sporophyte stage of the life cycle. Sporophytes have diploid genomes, but they produce haploid spores. These spores are the result of meiotic cell division.

Detailed explanation-5: -In plants, spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes.