gymnosperms- chapter 18. naked versus enclosed seed plants gymnosperms –gymno- gr. naked....
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Gymnosperms- Chapter 18
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Naked versus Enclosed Seed Plants
• Gymnosperms– Gymno- gr. naked.– Sperma- gr. seed.
• Angiosperms– Angeion- gr. vessel.– Sperma- gr. seed.
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Extant Gymnosperms
• Match the common name on the right to the phylum on the left.– 1) Cycadophyta a. ginkgo– 2) Ginkgophyta b. conifers– 3) Coniferophyta c. cycads– 4) Gnetophyta d. gnetophytes
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Cycadophyta• Cycas- gr. palm.• Tracheids, but no vessel elements.• Sperm present, multiflagellated.• Palmlike leaves.• Pollen tube does not fuse with
the egg cell.• Ovulate (megasporangiate) &
microsporangiate cones simple & on separate plants.
• 11 genera & 140 species. • Examples- Cycas & Zamia.
Zamia
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Cycas
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Ginkgophyta• Yin- ch. silver, hing- ch. apricot.• Tracheids, but no vessel elements.• Sperm present, multiflagellated.• Fan-shaped leaves.• Pollen tube does not fuse with the
egg cell.• Ovulate & microsporangiate cones
on separate plants; fleshy-coated seeds.
• 1 genus & 1 species. • Examples- Gingko biloba=
maidenhair tree.
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Coniferophyta• Con- gr. cone, fer- L. bear.• Tracheids, but no vessel elements.• Sperm not motile.• Needlelike or scalelike leaves.• Pollen tube fuses with egg cell.• Ovulate & microsporangiate
cones on same plant; ovulate cones compound.
• 70 genera & 630 species. • Examples- Pinus, Picea,
Juniperus, Abies, Cupressus.
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True or False. These winglike structures arefemale pollen grains.-------------------------->
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Pinus- pine (Pinaceae).
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Metasequoia- Dawn redwood.
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Wollemia nobilis- Wollemi pine.
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Gnetophyta• Gneto- Malay gnenom.• Tracheids and vessel elements.• Sperm not motile.• Scalelike, leaflike, broad and
leathery leaves.• Pollen tube fuses with egg cell.• Ovulate & microsporangiate
cones compound & mostly borne on separate plants.
• 3 genera & 70 species. • Examples- Gnetum, Ephedra,
Welwitschia.
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Gnetum
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Ephedra
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Welwitschia