Q. Except skin, other physical barriers which also helps to prevent the entry of the microorganisms are I. mucus coating of the epithelium lining the respiratory II. gastrointestinal tracts III. urogenital tracts Choose the correct option
A) I and II
B) I and III
C) II and III
D) I, II and III
Explanation
Physical barriers: skin on our body is the main barrier, which prevents entry of the microorganisms. Mucous coating of the epithelium lining in the respiratory, gastrointestinal and urogenital tracts also helps in trapping the microbes entering our body
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.