what does embryonal axis of a seed mean?

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Solution

The embryo, or immature plant, is divided into regions by an embryonic axis region that eventually becomes the stem.
A typical eudicot embryo consists of an embryonic axis, attached to two cotyledons. Monocot embryos have only one cotyledon.
The hypocotyl is the embryonic axis below the cotyledons and terminates in the embryonic root known as radicle.
Epicotyl is the embryonic axis above the cotyledons and below the first pair of miniature leaves

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