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10 Cards in this Set
- Front
- Back
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What Class does Archaeopteris belong to?
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Class Progymnospermopsida
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What is PYCNOXYLIC WOOD?
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-has small, densely packed tracheids
-found in CALLIXYLON -closely resembles woody stems of many coniferous seed plants |
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What constitutes a seed?
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-indehiscent
-integumented megsporangium |
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What are advantages of adopting the seed habit?
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-ultimate in protection of the early embryonic plant
-provides a food reserve that givse the embryos a competitive edge, especially in drier or marginal environments where establishment of the next generation is difficult |
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What is MANOXYLIC WOOD?
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-soft wood
-ie: Cycads |
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What is the NUCELLUS?
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-basically th megasporangium
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What constitutes the OVULE?
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-nucellus and integument
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Define POLLINATION
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-the transfer of pollen to the ovule by whatever means
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Whats the difference between an ovule and a seed?
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Ovule
-before fertilization Seed -after fertilization |
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Define HETEROTHALLISM
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-sex difference in the gametophytes
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