Name the plant hormones responsible for the following (a) elongation of cells (b) growth of stem (c) promotion of cell division (d) falling of senescent leaves.
 
a. Elongation of Cells:

b. Growth of Stem:

c. Promotion of Cell Division:

d. Falling of Senescent Leaves:
Answer variants:
Gibberellin
Auxin
Abscisic acid
Cytokinin