Q.1:- Define the following:
(a) Exocrine gland
(b) Endocrine gland
(a) Exocrine Glands: These glands have ducts. They secreted their secretions through ducts.
(b) Endocrine Glands: Endocrine glands do not have ducts. They directly secrete their secretions.
(c) Hormone: Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.