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15 Cards in this Set
- Front
- Back
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what is a seedless vascular plant's key innovation? what is an ex?
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vascular tissue
fern |
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is the gametophyte or the sporophyte dominant in seedless vascular plants? is it n or 2n?
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sporophyte, 2n
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where are the spores made?
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sporangia
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are the sperm motile or immotile in seedless vascular plants?is this a limitation or no?
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they are motile which means they need water
a limitation |
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are these seedless vascular plants heterosporous or homosporous?
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homosporous
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name 3 distinct characteristics/key innovations of gymnosperms?
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1.naked seed(not covered by fruit)
2.non-motile gametes(dont need water to reproduce) 3.reduced size and complexity of gametophytes(evolutionary trend) |
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what is an example of a gymnosperm? why are gymnosperms economically important?
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pine tree
they give us wood and paper and when we cut down means less "transportaion"-> less water in atmosphere->warmer temps(global warming) less photosynthesis->more CO2 in the air->more polution->global warming |
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what are the 4 groups of gymnosperms?
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cycads,gingko,conifers(pine trees),gnetales(gnetophytes)
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what prevents syphillis?
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ephedra hevadensis a type of gnetale
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are gymnosperms heterosporous or homosporous?
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heterosporous
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why are gymnosperms organized on the phylogenic tree oddly?
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because not sure which one evolved first
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distinguish between megaspore and microspore?
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megaspore=female spore
microspore=male spore |
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what was the gymnosperms contribution?
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the seed
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why is the seed important?
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1.dispersion(can go anywhere to grow desert,ocean)
2. germinate,grow,hatch when they find the conditions favorable(some can stay dormant and wait 100 yrs to grow) |
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what does the seed consist of?
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-the seed coat=sporophytic tissue from the mother
-the food reserves that are derived from the megagametophyte -the embryo, which is derived from the union of sperm and egg |
