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प्रश्न
How far does Selaginella one of the few living members of lycopodiales (pteridophytes) fall short of seed habit.
उत्तर
Selaginella produce two kinds of spores, macro (large) and micro (small) spores. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. But Selaginella falls short of seed habit due to lack of integument around the megasporangium.
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संबंधित प्रश्न
Briefly comment on the significance of heterospory.
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?
Gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.
