PLANT AND ANIMAL HORMONES

Ø Plant hormones (also known as phytohormones) are signal molecules, produced within plants, that occur in extremely low concentrations.

Ø Unlike in animals (in which hormone production is restricted to specialized glands) each plant cell is capable of producing hormones.

Types of Plant Hormones :

Ø There are five major classes of plant hormones. They are:

1. Auxins

2. Cytokinins

3. Gibberellins

4. Abscisic Acid (ABA)

5. Ethylene

Pituitary Gland:

Ø The pituitary gland or hypophysis is a pea shaped compact mass of cells located at the base of the midbrain attached to the hypothalamus by a pituitary stalk.

Parathyroid Gland :

Ø The parathyroid glands are four small oval bodies that are situated on the posterior surface of the thyroid lobes.

Ø The chief cells of the gland are mainly concerned with secretion of parathormone.

Adrenal Gland:

Ø The adrenal glands are located above each kidney.

Ø They are also called supra renal glands.

Ø The outer part is the adrenal cortex and the inner part is the adrenal medulla.

Ø The two distinct parts are structurally and functionally different.

MIND MAPS