The epicotyl and hypocotyl contribute to the plant's shoot system development.
Epicotyl is the portion of the stem of a seedling located between the cotyledons and the first true leaves, while the hypocotyl is the region below the cotyledons. In dicots, the hypocotyl extends above ground giving rise to the stem of the plant, while in monocots, it does not elongate above ground. The epicotyl and hypocotyl together contribute to the development of the plant's shoot system.
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