Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as

1. Homosporous 2. Heterosporous 
3. Homosorus 4. Heterosorus
Subtopic:  Pteridophytes: Heterospory |
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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
Subtopic:  Pteridophytes: Heterospory | Pteridophytes |
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