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9 Cards in this Set
- Front
- Back
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advantage of seed plants
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-protect embryo
-stores food -secondary growth -heterosporus -megaphylls reduced to needless |
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Coniferophyta
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Pinaceae: pines, cedars, firs, spruces, hemlock,
larch |
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pine leaves
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-Long lived (2-4 yrs)
-45 yrs in bristlecone pine -adaptation to dry -Thick cuticle |
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most are ___
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Mostly Monoecious
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Pine male cones
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Many microspore mother cells per
microsporangium (like anther) Meiosis in spring |
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Pollen grain: 4 celled haploid gametophyte
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- one tube cell
- one generative cell - two other prothallial cells (degenerate, no function) |
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Pine ovulate cones
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Seed-scale complex
each scale has 2 ovules |
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huge suspensor pushes
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Push embryo out of archegonia
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takes long time to fertilize and make seed
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After pollination
1 month: meiosis 6 mo: Development of gametophyte starts 15 mo: 2-3 archegonia (about 2000 cell gametophyte) |
