Plant stem

3/14/13 8:53 AM Three main structures: Roots Tap root lateral roots arises from pericycle outer most layer in vascular cylinder generally penetrate deeply ground water not close to the surface eudicots Fibrous roots don?t penetrate deeply shallow soil or a lot of rain fall monocots Root hairs increases surface area most of the absorption occurs here Stems Nodes point at which leaves are attached Internodes the sections between the nodes Auxiliary bud structure that forms a lateral root (branch) growing auxiliary bud means lateral shoot Apical bud (terminal) inhibits growth apical dominance inhibits the auxiliary buds if sunlight is more intense on one side, the auxiliary buds break dormancy Stems with additional functions such as food storage or asexual reproductions