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प्रश्न
How are the male and female gametophytes of pteridophytes and gymnosperms different from each other?
उत्तर
Male and female gametophytes of pteridophytes are free-living while in gymnosperms male and female gametophytes do not have free-living existence. They remain within the sporangia retained on sporophytes
| Pteridophytes | Gymnosperms |
| (i) Flagellated male gamete | (a) Non-flagellated male gamete |
| (ii) Water is essential for fertilisation | (b) Water is not essential |
| (iii) Pollen tubes are not formed | (c) Pollen tubes are formed |
| (iv) Archegonia with neck canal cells | (d) Neck canal cells are absent |
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.
Gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.
