$IBA$ is a

Substances which originate at the tip of the stem and control growth elsewhere are

Indole-$3$-acetic acid,known as auxin,was first isolated from:

Apical dominance means

Water can be absorbed from a hypertonic external solution by

Which of the following is the best explanation for the excurrent $(pyramidal)$ shape of $Pinus$ (the branches giving the plant the appearance of a tall cone)?