in Morphology of Flowering Plants by
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The plumule of the embryo develops into stem. It is the aerial part of the plant contributing the main axis. The stem is the positively phototropic and negatively geotropic part of the plant. It is the ascending part of the plant. The stem bears the leaves, buds, flowers and fruits these altogether constitute the shoot system. The point of the stem where the leaves arise is known as the node. The parts of the stem between two consecutive nodes are known as the internode. It is one of the characteristic feature of the stem where it is absent in the root.