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hypocotyl

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Above the radicle is the embryonic stem or "hypocotyl", supporting the cotyledon(s). en.wikipedia.org

Many dicots have epigeal emergence, in which the hypocotyl elongates and becomes arched in the soil. en.wikipedia.org

Here the hypocotyl is a rudimentary axis between radicle and plumule. en.wikipedia.org

Soybean cultivars comprise approximately 8% seed coat or hull, 90% cotyledons and 2% hypocotyl axis or germ. en.wikipedia.org

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