bryophyta characteirtics
Answers
Answer:
General Characteristics of Bryophytes (Liverworts, Hornworts and Mosses) are:
a) All of these are land plants (terrestrial) with some aquatic forms.
b) They are very small. The sporophyte and gametophyte have very different morphologies (heteromorphic generations) and the sporophyte is usually partly dependent on the gametophyte.
c) Photosynthetic, non-vascular plants
d) Plant body is either :-
1)Thalloid and attached to the substratum by hair-like structures called rhizoids (true roots are absent) or
2)is differentiated into stem-like (caulalia) and leaf-like structures (phyllids), true stems and leaves lacking.
e) Cuticle and stomata are absent.
f) The bryophytes show alternation of generations - the haploid gametophyte (producing gametes for sexual reproduction) alternates with diploid sporophyte (producing spores for asexual reproduction).
g) Gametophytes homothallic or heterothallic.
h) The gametophyte generation is dominant, conspicuous and independent.
i) The female sex organ is the archegonium.
j) The male sex organs are antheridia.
k) The ovum remains in the archegonium and spermatozoids swim to it by chemotaxis.
l) Although bryophytes are land plants, they are still dependent upon water for fertilization, as the sperm swim in a water film.
m) The sporophyte is attached and dependent upon the gametophyte for nutrition i.e. is parasitic on the gametophyte
n) The diploid sporophyte usually consists of a basal foot, an elevating seta and a terminal sporangium - the capsule
o) Spores are produced as a direct result of meiosis.
p) Spores dispersed by a mechanism which ensures dispersal in dry weather only.
q) These plants (in either generation) lack specialized cells for the transport of materials (vascular tissue). Absence of vascular tissue limits bryophytes to moist habitats and small size.
Answer:
Bryophytes include the various mosses and liverworts.
Commonly grows in moist shaded areas in the hills.
Also called amphibians of plant kingdom because can live in soil but depends on water for sexual reproduction.
Play an important role in plant succession on bare rocks/soil.
plant body of bryophytes is more differentiated than algae.
lack true root, stem,leafs.
main plant body is haploid...