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develpoment

Postby the kid » Fri May 26, 2006 9:15 pm

what do epicotyls and hpyocotyls develop into? i keep finding complex answers which my 9th grades would not understand.. any help will be greatfuly appreciated.
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Postby daniel.kurz » Sat May 27, 2006 1:37 am

I am a 10th grader and this is the answer that I was given. I think that this explanation will help.

Here you go:
In a few plants, such as the orchids, the embryo is a small, undifferentiated mass of cells until after the seed has parted from the parent plant; during the period between separation from the parent plant and eventual germination, the undifferentiated cells develop into an embryonic root, bud, stalk, and leaf. In most other plants this development occurs prior to seed dispersal: the embryonic root, or radicle, usually grows toward the micropyle; the embryonic bud, called plumule, or epicotyl, is at the end of the embryo opposite to the radicle; the embryonic stem, or hypocotyl, connects the radicle with the seed leaves, or cotyledons. In gymnosperms, several cotyledons are usually present; among angiosperms two great groups of plants exist, one group having but one cotyledon in the seed and known as the monocotyledons, and the other with two cotyledons and known as dicotyledons. The cotyledons serve as centers of absorption and storage, drawing nutritive material from the endosperm. The cotyledons of many plants, such as the sunflower, function as primary photosynthetic organs after germination and before the development of foliage leaves from the plumule.
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