Question

Select important characteristic features of mammals.

• A. Four-chambered heart
• B. Fore-limbs and hind limbs
• C. Milk-producing glands
• D. Post anal tail

Answer 1

The correct option is C Milk-producing glands

A. Four chambered heart: This type of heart is present in reptiles, birds, and mammals. So, it is not unique to mammals.

B. Forelimbs and hind limbs: These are present in amphibians, reptiles, birds, mammals. So, it is not unique to mammals.

C. Milk producing glands: These are called the mammary glands and are present only in the mammals. Their main function is to feed milk to the young ones.

D. Post anal tail: All the chordates have a post-anal tail. So, it is not unique to mammals.

So, the correct option is C.