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24 Cards in this Set
- Front
- Back
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How many species are there in the Order Angiosperms>
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260,000
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What types of food crop are made up by angiosperms?
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corn, potatoes
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What has angiosperms influenced?
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insects, birds, mammals
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What is an outstanding structure that the angiosperms have?
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the flower-specialized short shoot, fruit ripened ovary
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How many species belong to the angiosperms that provide for the world's bulk of food crops?
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15
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What are the two classes of angiosperms?
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monocots, eudicots
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What is a vessel?
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seeds enclosedi n carpels (pistils may have 1 or more carpels)
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What are some features of angiosperms?
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gametophytes smaller than in other groups, female gametophyte added protection of ovary wall, double fertilization
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What is double fertilization?
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sperm + egg and sperm + 2 polar nuclei (triple fusion) products are zygote and primary endosperm
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what are perfect flowers?
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when they have both male and female parts
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What is a complete flowers?
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a flower in which all four parts are present- sepal, petal, stamen and carpel
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What is a bisexual flower and a unisexual flower?
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bisexual- perfect flower- has both stamens and carpels
unisexual- a flower in which either stamens or carpels are lacking |
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What is a staminate flower?
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a unisexual flower possessing only an androecium
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What is a carpellate or pistillate flower?
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a flower possessing only a gynoecium
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What are hypogynous?
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floral parts under the ovary; inferior
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What is perigynous?
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floral parts surround the ovary- superior
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What is epigynous?
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the ovary is free of surrounding parts-parts are inferior
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What is head inflorescence?
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when there are hundreds of flowers in the center- ex. sunflower, petals are actually individual flowers- a compact, indeterminate inflorescence, consisting of sessile, flowers closely attached to the top of an expanded stem
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What is a raceme inflorescence?
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an indeterminate inflorscence, consisting of a central stalk and pediceled flowers
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What is parietal?
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one chamber with ovules on one side
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What is free central?
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stalk in the center axis where the ovules come off
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Pollen finds way to sepal of angiosperms how?
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by wind or animals
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Describe Embryo sac development? (female gametophyte)
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ovules contains the female ^ with egg cell surrounded by the nucellus and integuments, will become seed after fertilization
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How long can pollen last?
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for thousands of years b/c of its resistant coat
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