Question

Question 1 Define the following:

(a) Exocrine gland

(b) Endocrine gland

(c) Hormone

Class - XI - Biology Chapter Chemical Coordination and Integration Page No. 341

Answer 1

(a) exocrine gland are gland that produces and secret substance an epithelial surface by way of a duct.
(b) endocrine gland are gland system that secret their products , hormones, directly into the blood rather than through a duct
(c) a regulatory substance produced in a organisms and transport in tissue such as blood

Answer 2

(a) Exocrine gland: Glands that discharge their secretions into ducts are known as exocrine glands.

(b) Endocrine gland: Glands that do not discharge their secretions into ducts are known as endocrine glands. These glands discharge their secretions directly into the blood. 

(c) Hormone: Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.