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Main plant body is haploid gametophyte which is dominant & photosynthetic . There are no free-living sporophytes. Meiosis in the zygote (zygotic meiosis) results in the formation of haploid spores hence no embryo is formed.
Algae, including Volvox, Ulothrix, Spirogyra,Chlamydomonas exhibit haplontic life cycle.
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– Diploid sporophyte is dominant, photosynthetic and independent. – The gametophytic short lived, single to few-celled haploid that is dependents on sporophyte.
All seed bearing plants(Gymnosperm and angiosperm), some green algae (Caulerpa) and some brown algae (Fucus, Sargassum).
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– In the haplo-diplontic life cycle, both phases (gametophyte and sporophyte) are multicellular and are equally dominant.
Ectocarpus, Polysiphonia, kelps exhibit haplo-diplontic life cycle patterns
Haplo-diplontic life cycle pattern is commonly seen in Bryophytes and Pteridophytes.
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life cycle of any sexually reproducing plant, there is an alternation of generations between gamete-producing haploid gametophyte and spore-producing diploid sporophyte.