Plant Hormones

Apical bud

Growth point of the plant.

Apical dominance

Phenomenon in plants where a high auxin concentration in the apical bud inhibits the growth of the lateral buds in close proximity / Phenomenon in plants where the lateral buds further away from the apical bud grow faster than those lateral buds closer to the tip / Plants develop a pyramidal shape

Tropism

Growth movements of a part of a plant in response to certain stimuli.

Phototropism

Growth response of a plant in reaction to a light stimulus.

Geotropism

Growth response of a plant in reaction to gravity / gravitational pull.

Clinostat

Apparatus with a small motor that rotates at a constant speed.

Auxin

Plant hormone that stimulates apical dominance and tropic movements in plants.

Gibberellins

Plant hormone that enhances the growth of internodes.

Abscisic acid

Plant hormone that generally inhibits growth.