Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion Bacteria and other particles pass down the wind pipe and enter the lungs, causing damage to the tissue. Reason Smoking reduces ciliary effectiveness.A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but the Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false
Correct Answer: A
Solution :
Cilia in the respiratory tract of humans sweep invading bacteria and particles up the trachea and away from the lungs. If ciliary effectiveness is reduced because of smoking, invading organisms or particles could pass down the windpipe and enter the lungs, causing damage to the delicate lung tissue that might result in disease.
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