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प्रश्न
Differentiate between the following:
Homosporous and heterosporous pteridophytes
उत्तर
| Homosporous pteridophytes | Heterosporous pteridophytes | |
| 1. | In these pteridophytes, only one kind of spore is produced. | In these pteridophytes, two kinds of spores are produced. |
| 2. | The spores are equal in size. | The smaller spores are called microspores and larger spores are called megaspores. |
| 3. | The spores are produced from the same sporangia. | The microspores are produced from the microsporangia and the megaspores are produced from the megasporangia. |
| 4. | The spores develop one kind of gametophyte. | The microspores develop into male gametophytes, whereas the megaspore develops into female gametophytes. |
| 5. | Spores germinate in soil and produce independent gametophyte. | Spores germinate within sporangia and produce dependent gametophyte. |
| 6. | eg. Lycopodium | eg. Selaginella, Salvinia |
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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?
How far does Selaginella one of the few living members of lycopodiales (pteridophytes) fall short of seed habit.
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.
