Auxin is a growth type of this substance; it regulates plant growth, especially in stems
The substance was named cytokinin and it is involved in cell division and in the... [DOC] [TLE] Plant Growth, Development, and Response to the ... - Sumanas, Inc. [PAR] Shoots grow towards the light because of auxin, a plant hormone produced in the 
... Auxin promotes elongation of cells on the shady side of the stem.