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10 Cards in this Set

  • Front
  • Back
What Class does Archaeopteris belong to?
Class Progymnospermopsida
What is PYCNOXYLIC WOOD?
-has small, densely packed tracheids
-found in CALLIXYLON
-closely resembles woody stems of many coniferous seed plants
What constitutes a seed?
-indehiscent
-integumented megsporangium
What are advantages of adopting the seed habit?
-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
What is MANOXYLIC WOOD?
-soft wood
-ie: Cycads
What is the NUCELLUS?
-basically th megasporangium
What constitutes the OVULE?
-nucellus and integument
Define POLLINATION
-the transfer of pollen to the ovule by whatever means
Whats the difference between an ovule and a seed?
Ovule
-before fertilization

Seed
-after fertilization
Define HETEROTHALLISM
-sex difference in the gametophytes