Question

Which of the following is are the exclusive feature of mammal? (not found in any other animal group)
(a) Diaphragm
(b) Seven cervical vertebrate
(c) Mammary glands
(d) Gives birth to young ones
(e) Non nucleated RBC
(f) Pinna
(g) Corpus callosum in brain.

• A. a, b, c, d, e, f, g
• B. a, c, e, f, g
• C. a, b, d, e, f
• D. a, b, d, e, f, g

Answer 1

The correct option is A a, b, c, d, e, f, g

All the mentioned features are the exclusive characteristics of mammals.

However, there are some exceptions like:

• The corpus callosum is only found in placental mammals. It spans part of the longitudinal fissure, connecting the left and right cerebral hemispheres, enabling communication between them.

• Echidna and platypus are monotremes (egg-laying mammals).
  
• Echidna does not have pinna (external ear).
  
• Camels have nucleated RBC.

So, the correct option is A.