(a) Give one example each of the following :
(i) Merocrine glands (ii) Apocring glands (iii) Holocrine glands.
(b) How these glands differ from each other ?

Explanation

(a) (i) Merocrine glands - i.g. sweat glands. (ii) Apocrine glands - e.g., mammary glands. (iii) Holocrine glands - e.g., sebaceous glands.
(b) These three types of glands differ from each other in terms of mode of releasing the secretion.