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27 Cards in this Set
- Front
- Back
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what are seed plants called |
spermatophytes- all heterosporous and have a dominant sporophyte life stage |
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what two adaptations help land plants withstand droughts? |
they have seeds, they have pollen |
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how do seeds form pollen? |
pollen is naturally transferred to an egg then it fertilizes it |
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what group of plants has flowers and fruit? |
angiosperms. |
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what is in a flower |
the sperm and the egg |
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where does the fruit come from |
the seed in the flower |
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gymnosperm |
naked seed- no fruit |
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4 characteristic of gymnosperms |
1. naked seeds 2. separate female and male gametes 3. pollination by wind 4. tracheids that transport water in the vascular system (no vessel elements) |
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strobili |
entire cone |
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sporophyll |
individual leaves/pieces of cone |
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sporangium |
where spores are made |
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integument |
skin layer |
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gymnosperm |
live in areas with little water dominate sporophyte phase can be monoecious or dioecious don't need as much photosynthesis |
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genophytes |
ephedra, dessert, produces ephedrine, decongestant, also meth amphetamines |
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function of flower |
ensure pollination |
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perfect flower |
contain both sex organs |
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imperfect |
only one sex |
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function of a fruit |
to spread the seed |
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dry fruits |
rice, wheat, nuts |
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fleshy fruits |
berries, peaches, apples, grapes |
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how can fruit shape correlate with dispersal method |
coconut seeds hollow, travel on water dry fruits and dandelions, wind |
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roles seeds play |
medicinal, industrial production |
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defense mechanisms |
spines, bad smells |
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percentage of angiosperms pollinated by animals |
80% |
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how do flowers attract pollinators |
color, shape |
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uses of seed plants |
aesthetic appeal, chocolate, food, paper |
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medicine we get from seed plants |
steroids from yams |
