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8 Cards in this Set
- Front
- Back
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Gymnosperm groups
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cycads
ginkos gnetophytes conifers |
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gymnosperm pollen grains are surrounded by protective
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sporopollenin
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cycads
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-most primitive
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ginkgo
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-only species is ginkgo biloba
-male and female unisexual trees |
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gnetophytes
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-only group with vessels in xylem
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ephedra
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gnetophyte w/ ephedrine, used for asthma, allergies, etc.
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each megasporangium on a female cone also called a
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nucellus
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# of cells per gametophytes?
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female=2,000 cells
male=4 cells |
