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3 Cards in this Set
- Front
- Back
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About how long ago did vascular plant appear? What is the fossil evidence for this? |
They appear about 420 may, known from xylem cells. Complete fossil vascular plan Cooksonia estimates 400 may (million years ago) |
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Distinguish between homosporous and heterosporous plants. Provide an example genera for each. |
Homosporous: start as sporoangium on sporophyll, a single type of spore, typically a bisexual gametophyte with both eggs and sperm. E.g. lycopodium Heterosporous: posses two types of sporangia: microsporangia turn to microspores which become make gametophytes. Megasporangia turn to megaspores which become female gametophytes. E.g. selaginella |
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What are the two extant phyla of vascular plants? Provide example genera of each phylum. |
Gymnosperms: seed producing plants such as conifers, cycads, ginkgo, and gnetales. Angiosperms: flowering plants, such as rises, lilies, etc. |
