Question

Assertion : All terrestrial mammals are air breathers.
Reason : Because of terrestrial habitat, they have well‐developed lungs for air breathing.

• A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion
• B. If both Assertion and Reason are true, but Reason is not a correct explanation of the Assertion
• C. If Assertion is true, but the Reason is false
• D. If Assertion is false and Reason is true

Answer 1

Answer: (A)

All terrestrial mammals are air breathers. Because of terrestrial habitat, they have well developed lungs for air breathing. As external respiration takes place in terrestrial animals, three conditions are necessary for this purpose, (i) there should be a large vascular surface with thin blood capillaries, (ii) The membrane of the respiratory surface should be thin and should remain moist (iii) there should be a respiratory pigment and a respiratory medium. All these purposes are successfully served by lungs. Thus well developed lungs make the terrestrial animals air breathers.