Question

Importance of heterospory in evolution of early land plants

Answer 1

1. Pteridophytes are the first true land plants.
2. Being the first successful colonisers in land habit pteridophytes show both the homospory and heterospory.
3. Most of the pteridophytes are homo­sporous,
4. produce isospores which are morpholog­ically and physiologically identical.
5. On exosporic germination the spores produce monoecious gametophytes bearing both antheridia and arche­gonia.
6. While, heterospory has been reported in nine genera namely,
7. Selaginella, Isoetes,
8. Stylites, Pilularia,
9. Regnellidium, Marsilea,
10. Salvinia,
11. Azolla and Platyzoma.
12. Heterosporous forms produce two kinds of spores:
13. microspores produced in microsporangia and megaspores within megaspo­rangia.

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