Question

Complete the pair.
Use of organs : .....(a)..... :: Disuse of organs : .....(b).....
(Ostrich wings/ Legs of swan / Human Nostrils)

• A. (a) Human Nostrils, (b) Legs of swan
• B. (a) Ostrich wings, (b) Human nostrils
  
• C. (a) Legs of swan, (b) Ostrich wings
  
• D. (a) Human Nostrils, (b) Ostrich wings
  

Answer 1

The correct option is D (a) Human Nostrils, (b) Ostrich wings

Use of organs: (a) Human Nostrils
Disuse of organs: (b) Ostrich wings
Human nostrils play an important role in the olfaction process (sense of smell). It also helps in moistening and warming the inhaled air and thereby facilitating the process of respiration.
Ostrich is considered as the largest bird, but the wings of ostrich are of no use. Ostrich does not fly, so wings in ostrich refer to the disuse of organs.

So, the correct answer is '(a) Human Nostrils, (b) Ostrich wings'.