Chapter 30, Problem 7A

Summary Introduction

Introduction:

The mammals are the organism that have a hairy body in general and have mammary glands for feeding their young ones. The sweat glands and the oil glands are present in the skin of the mammals, especially humans.

Answer to Problem 7A

Correct answer:

Option (A).

Explanation of Solution

Explanation/justification for the correct answer:

Option (A) hair and skin maintenance, temperature regulation and milk production. The oil glands are responsible for the production of natural oils that maintains the outer most layer of skin and keep the hair follicles healthy. The sweat glands produce watery secretions, which helps in the maintenance of the temperature by evaporation. The mammary glands secrete milk that help in nourishing the young ones. Hence, the correct answer is option (A).

Explanation for incorrect answer:

Option (B) reproduction, hair and skin maintenance and temperature regulation. None of the given glands are involved in the reproduction process. Hence, it is an incorrect answer.

Option (C) temperature regulation milk production and reproduction. None ofthe glands are involved in reproduction. Hence, it is an incorrect answer.

Option (D) milk production, oxygen delivery and skin maintenance. The delivery of oxygen is done by a component present in red blood cells of blood called hemoglobin. Hence, it is an incorrect answer.