(i) Bulbils are modified and enlarged bud, meant for propagation.
(ii) When bulbils detach from parent plant and fall on the ground, they germinate into new plants and serve as a means of vegetative propagation.
(iii) In Agave and Allium proliferum floral buds get modified into bulbils.
(iv) In Lilium bulbiferum and Dioscorea bulbifera, the bulbils develop in axil of leaves.
(v) In Oxalis, they develop just above the swollen root.

(i) The stem is usually the aerial portion of the plant.
(ii) It is positively phototropic and negatively geotropic.
(iii) It has nodes and internodes.
(iv) Stem bears vegetative bud for vegetative growth of the plant, and floral buds for reproduction, and ends in a terminal bud.
(v) The young stem is green and thus carries out photosynthesis.
(vi) During reproductive growth stem bears flowers and fruits.
(vii) Branches arise exogenously.
(viii) Some stems bears multicellular hairs of different kinds.

Tuberous root:These roots are swollen without any definite shape. Tuberous roots are produced singly and not in clusters. eg.Ipomoea batatas.
Fasciculated root: These roots are in cluster from the base of the stem. eg.Dahlia, Asparagus, Ruellia.
Nodulose root: In this type of roots swelling occurs only near the tips. eg.Maranta (arrow root) Curcuma amada (mango ginger), Curcuma Zonga (turmeric).
Moniliform or Beaded root: These roots swell at frequent intervals giving them a beaded appearance. eg.Vitis, Portulaca, Momordica Indian spinach.
Annulated root: These roots have a series of ring-like swelling on their surface at regular intervals. eg.Ipecac (Psycho tria)