bryophytes Flashcards
bryophytes include
liverworts and mosses
liverworts shared common characteristics with
mosses
amphibians of plant kingdom
bryophytes
why bryophytes are called amphibians of plant kingdom
they live on land but requires water for sexual reproduction
bryophytes are more differentiated then algae in terms of
prosteateor erect thallus like attached to substratum with the help of rhizoids they are unicellular but gametes are multicellular their main body is haploid they lack true roots stem and leaves but posses root like stem like leaf like st they are gametophytic
male and female st
antherodium and archegonium
instead of zygote which st undergoes reduction division
sporophytes
sporophytes derive nutrition from
gametophytes
moss, provide peat that have long been used as
fuel, and because of their capacity to hold water as packing material for
trans-shipment of living material.
sphagnum
first organism to colonise rocks
mosses and lichens
plant body of liverworts are
thalloid like
asexual reproduction in liverwort is by
fragmentation of thalli or by formation of sp st called gemmae
gemmae of mercantia are
green multicellular asexual buds localised in small recepticle called gemmaecup
during sexual rep male and female sex organs of liverworts are produced in
same or different side of thalli
in mercantia after meiosis spore germinates into
gametophytes
spores of liverwort are differentiated into
foot seta capsule
The predominant stage of the life cycle of a moss is the
gametophyte
gametophyte has two stages
The first stage is the protonema stage, which
develops directly from a spore. It is a creeping, green, branched and
frequently filamentous stage. The second stage is the leafy stage, which
develops from the secondary protonema as a lateral bud. They consist of
upright, slender axes bearing spirally arranged leaves. They are attached
to the soil through multicellular and branched rhizoids.
mosses bears sex organ in which stage
secondary leafy stage
Vegetative reproduction in mosses is by
fragmentation and budding
the spores of both mosses and liverworts has
foot seta and capsule
examples of mosses
funaria polytrichnum sphagnum
