bio notes 2-13
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bio notes 2-13
what are the clades of seedless vascular plants?
club mosses, whisk ferns, ferns, horsetails
which clade has microphylls (simple scale-like leaves)?
what is another name for horse tails?
which clade has reduced megaphylls that form whorls, impregnated with silica
which clade has reduced or no megaphylls
which clade has large megaphylls with branching vascular strands that emerge as fiddleheads?
describe sporangia in leptosporangian ferns?
found in clusters (sori), have thin walls (only 1 cell thick), protected by an indusium
what is an application of seedless vascular plants?
club moss spores used as flash powder
what is a word for "living today"?
what does the xylem in gnetophytes and angiosperms contain?
tracheids and sometimes vessel elements
What are some advantages of secondary growth?
provide support to grow taller, helps light absorption and seed dispersal
what are some characteristics of seed plants?
sperm no longer swims to egg, have vascular tissue, secondary growth, gametes are greatly reduced, heterosporus, have seeds
what 2 types of spores are developed by meiosis?
microspore(n), megaspore (n)
what develops into a tiny microgametophyte (pollen grain) that produces 2 sperm by mitosis
what develops into a microscopic megagametophyte that produces 1 egg by mitosis?
what are the 3 generations of seeds?
seed coat, nutritive tissue, and embryo
what is derived from the integument of the parent sprophyte?
what generatoin is derived from the female gametophyte?
what generation is the new sporophyte?
what are some advantanges of seeds?
protection, dispersal, nourishment, extended period of dormancy,