Question

what is the role of hypocotyl in epigeal germination

Answer 1

Epigeal germination implies that the cotyledons are pushed above ground. The hypocotyl (part of the stem below the cotyledon) elongates while the epicotyl (part of the stem above the cotyledon) stays the same length. In this way, the hypocotyl pushes the cotyledon upward.

Normally, the cotyledon itself contains very little nutrients in plants that show this kind of germination. Instead, the first leaflets are already folded up inside it, and photosynthesis starts to take place in it rather quickly.[1]

Because the cotyledon is positioned above the ground it is much more vulnerable to damage like night-frost [2] or grazing. The evolutionary strategy is that the plant produces a large number of seeds, of which statistically a number survive.

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Answer 2

Answer:

Epigeal germination implies that the cotyledons are pushed above ground. The hypocotyl (part of the stem below the cotyledon) elongates while the epicotyl (part of the stem above the cotyledon) stays the same length. In this way, the hypocotyl pushes the cotyledon upward.