Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as
1. | Homosporous | 2. | Heterosporous |
3. | Homosorus | 4. | Heterosorus |
From an evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:
1. | Gymnosperms | 2. | Liverworts |
3. | Mosses | 4. | Pteridophytes |