in Sexual reproduction in flowering plants by

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  1. Stem tuber is a modified stem for vegetative propagation.
  2. In a potato, some lateral branches are produced from the underground part of the stem which grow down in the soil.
  3. The tip of these branches are swollen since they store food.
  4. These tubers show the presence of nodes, internodes, scaly leaves and  axillary buds.
  5. A stem tuber has many notches on its surface called “eye”.
  6. These eyes which are seen on the surface of the tuber represent nodes.
  7. Each “eye” is a node and is made up of one or more axillary buds subtended by a leaf scar.
  8. Under favourable conditions, axillary buds develop into new plants.