ue34.14 Germination, The radicle, the root of the embryo, emerges from the seed furst Then the shoot breaks the soil surface by one of Cotyledons the following mechanisms: (a) In beans straightening of a hook in the hypocoty ulls the shoot and cotyledons from the Seed ceat boiL. (b) In peas. the hook is above the cotyledons on the epicotyl, and the cotyle dons remain in the ground. (c) In com and other monocots, the shoot grows straight up through the tube of the coleoptile 出土萌发 fal Bean 下胚伸长 Hypocotyl Cobbled Thi Pe 留土萌发 上胚仲长 胚茅鞘留土萌发 出土萌发 下胚轴伸长 上胚轴伸长 胚芽鞘