The plumule of the embryo of a germinating seed
grows into stem. The epicotyl elongates after embryo growth into the axis (the
stem) that bears leaves from its tip, which contain the actively dividing cells
of the shoot called apical meristem. Further cell divisions and growth result in the formation of mass
of tissue called a leaf primordium.
The point from which the leaf arises is called node. The region between two adjacent nodes is called internode.
Characteristic features of the stem
1. The stem is usually the aerial portion of the
plant
2. It is positively phototropic and negatively
geotropic
3. It has nodes and internodes.
4. Stem bears vegetative bud for vegetative growth
of the plant, and floral buds for reproduction, and ends in a terminal bud.
5. The young stem is green and thus carries out
photosynthesis.
6. During reproductive growth stem bears flowers
and fruits.
7. Branches arise exogenously
8. Some stems bears multicellular hairs of
different kinds.
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