Advertisements
Advertisements
प्रश्न
Gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.
उत्तर
The main plant body of the bryophyte is haploid. It produces gametes, hence is called a gametophyte. The sex organs in bryophytes are multicellular.
The male sex organ is called the antheridium. They produce biflagellate antherozoids or biciliated sperms. The female sex organ called archegonium is flask-shaped and produces a single egg. The antherozoids are released into the water where they come in contact with archegonium. An antherozoid fuses with the egg to produce the zygote. Zygotes do not undergo reduction division immediately. They produce a multicellular body called a sporophyte.
APPEARS IN
संबंधित प्रश्न
Briefly comment on the significance of heterospory.
Differentiate between the following:
Homosporous and heterosporous pteridophytes
Which one of the following belongs to vascular cryptogams?
In the prothallus of vascular cryptogram, the antherozoids and eggs mature at different times. As a result,
Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as ______
The main plant body in Pteridophyte is ______.
A Prothallus is ______.
Heterospory i.e., formation of two types of spores – microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in plant kingdom?
The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.
How are the male and female gametophytes of pteridophytes and gymnosperms different from each other?
