life cycle of moss class 11
Автор: Visible Science
Загружено: 2022-12-16
Просмотров: 7841
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Bryopsida (life cycle of moss)
Like liverworts most mosses inhabit damp
places. In contrast to other bryophytes they grow
equally well in fairly dry places. However, water
is essential in the reproduction of mosses, thus
they usually grow to form cushions or mats.
Each adult moss plant, a gametophyte, is always
diferentiated into structures which resemble
stem and leaves. Multicellular rhizoids are also
present. Examples of mosses are Funaria and
Polytrichum . Archegonia and antheridia,
develop on the tips of diferent branches on the
same plant e.g., Funaria, or on diferent plants
as in Polytrichum. The archegonia and antheridia
form clusters and are mixed with sterile hairs,
the paraphyses.
Formation of diploid sporophyte and haploid
spores follow the same sequence of events of
alternation of generations as in liverworts . However, the spore of a moss, unlike that of
liverworts, develops into an alga like structure, the
protonema. Haploid moss plants (gametophyte)
develop from buds on the protonema and the
life cycle is completed
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