Q.

Physical and physiological barriers respectively are 

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a

Skin and mucus membranes

b

Acid in stomach and tears from eyes

c

Mucus membranes and saliva in mouth 

d

Mucus membranes and neutrophils

answer is C.

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Detailed Solution

Skin and muculs membranes are physical barriers. 
Saliva, tears, acids are physiological barriers.

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