Question

Regarding the assertion and reason, select the right option.

Assertion [A]: Paralysis of cilia by tar leads to mucus accumulation that is harmful for the body.
Reason [R]: Beating movement of cilia throws out mucus-laden pathogens out of the body but their paralysis leads to mucus accumulation and rapid growth of pathogens inside the body.

• A. Both A and R are true and R explains A
• B. Both A and R are true, but R does not explain A
• C. A is true and R is false
• D. Both A and R are false

Answer 1

The correct option is A Both A and R are true and R explains A

Tar is a sticky brown substance present in cigarette smoke. Tar that enters the lungs along with cigarette smoke sticks and obstructs their movement. Beating of cilia is responsible for throwing out pathogens trapped in the mucus out of our respiratory tract. Due to paralysis of cilia, mucus starts getting accumulated in the respiratory tract. The mucus glands also start secreting copious amounts of mucus that gets accumulated in the air passage. Pathogens thus find a conducive environment to multiply, causing further damage to the lungs.