Question

what is meant by hypocotyl and epicotyl? what is their significance?

Answer 1

the epicotyl is the embryonic shoot above the cotyledons. In most plants the epicotyl will eventually develop into the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is the epicotyl. In monocot plants, the first shoot that emerges from the ground or from the seed is the epicotyl, from which the first shoots and leaves emerge.

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Answer 2

The region above the point of attachment of cotyledons is called epicotyl and the region below it is called hypocotyl.
The epicotyl elongates in hypogeal germination and hypocotyl elongates in epigeal germination