gymnosperms
"naked seeds" a diverse group of seed plants that are pollinated by wind, insects, and tracheids. characterized by separate female and male gametophytes, and pollen cones and ovulate cones.
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| Term | Definition |
|---|---|
gymnosperms | "naked seeds" a diverse group of seed plants that are pollinated by wind, insects, and tracheids. characterized by separate female and male gametophytes, and pollen cones and ovulate cones. |
paraphyletic group | groups where not all descendants of a single common ancestor are included in the group |
tracheids | transport water and solutes in the vascular system |
sporophyllis | modified leaves that partially shelter gymnosperms |
strobilus | tight arrangement of sporophylls around a central stock |
integuement | layer of sporophyte tissue surrounding megasporangium and embryo |
monoecious | male and female sporangia produced on same plant. |
dioecious | male and female sporangia produced on separate plants |
ovulate cones | female reproductive structures in gymnosperms |
micropyle | narrow passage near the base of the sporophyll. Through this passage, a pollen tube will later grow. |
megasporocyte | megaspore mother cell, undergoes meiosis in each ovule |
coniferophyta, cycadophyta, ginkogophyta, gnetophyta. | gymnosperm classified in 4 phyla |
conifers | dominant gymno. phylum. classified by tall trees, scale/needle like leaves, cold climate, evergreen trees. |
cyads | gymno. phylum classified by mild climates pollinated by beetles, ornamental plants in gardens in the tropics and subtropics. |
ginkgophytes | has one single surviving species -ginko biloba. unusually resistant to pollination, male and female organs produced on separate plants, seeds produced by female plant have off-putting smell. |