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31 Cards in this Set
- Front
- Back
what major changes did the development of seeds do for plants?
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- increased ability to disperse
- ability to store energy and nutrients for young sporophyte - did not have to grow out of parent gametophytes - higher evolutionary fitness, as it takes less time to produce |
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is the gametophyte generation contained in the sporophyte generation or vice versa?
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the gameotophye is contained within the sporophyte generation
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what is an ovule?
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protects the developing zygote in non-flowering seed plants by using its tissue to surround the zygote
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what is a seed?
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the resulting protected zygote that forms from the ovule encasing
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what are pollen grains?
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desiccation-resistant microgametophytes
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what does dioecious mean?
an example is.. |
that each tree is either male or female
an example is... ginkgos (ginkgophyta) |
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what are magnoliophyta?
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angiosperms
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magnoliophyta are broken up into two distinct lineages....
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1. monocots
2. dicots |
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three lineages of angiosperms..
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1. magnoliids
2. monocots 3. eudicots |
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what are composite flowers?
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inflorescences composed of many indidual flowers that look like a single flower from a distance.
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of the following... are they part of the gametophyte or sporophyte generations?
- pollen, ovary, egg, embryo |
- pollen: gametophyte
- ovary: sporophyte - egg: gametophyte - embryo: sporophyte |
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fruits are composed of what parts of a flower?
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angiosperm ovary (ovary and ovules)
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what is a seed composed of?
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an embryo and a food supply that can be dispersed
- endosperm, embryp & seed coat |
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germinate
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the embryo grows both its root and stem out into the environment; only does this when proper environmental signals allow (light, moisture, temp., etc.)
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monoclinous (perfect)
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having both male and female reproductive parts in one flower
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diclinous (imperfect)
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have either functioning male or functioning female reproductive parts in one flower but not both
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dioecious
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individual parts are either male or female but not both (depends on the species)
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monoecious
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individual plants can produce both male and female reproductive parts (dependent on the species)
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anthers
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male parts that contain microsporangia which produce haploid microspores that grow into haploid three-celled microgametophytes (pollen grains)
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pollen grains
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haploid three-celled microgametophytes that grow from microspores
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microsporangia
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found in the anthers and produce haploid microspores
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microspores
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produced from microsporangia, they are haploid and grow into three celled microgametophores (pollen grains)
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ovaries
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contain one or more ovules (megasporangia surround by integument)
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ovules (megasporangia)
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produced a haploid megaspore that develops into a megagametophyte
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megagametophyte
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called the embryo sac when mature, undergoes 3 mitotic divisions
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polar cell
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diploid and two nuclei (polar nuclei)
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stigma
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pollen lands on this stigma and then grows into a pollen tube
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pollen tube
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formed from pollen leads to the style of a flower and into an ovule in the ovary
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style of a flower
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leads down to the ovary, the passage that pollen takes to get to ovule
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sperm
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two haploid sperm are released when the pollen reaches the ovule
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when sperm fuses with the egg, what is formed?
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a diploid zygote
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