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(C) The innate immunity consists of four types of barriers:$1$. Physical barriers: The skin on our body is the main barrier which prevents entry of th

Vedclass · Accepted Answer

$P-II, Q-I, R-IV, S-III$

Vedclass · Answer

(C) The innate immunity consists of four types of barriers:$1$. Physical barriers: The skin on our body is the main barrier which prevents entry of the micro-organisms. Also,mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts helps in trapping microbes entering our body $(P-II)$.$2$. Physiological barriers: Acid in the stomach,saliva in the mouth,and tears from eyes prevent microbial growth $(Q-I)$.$3$. Cellular barriers: Certain types of leukocytes $(WBC)$ of our body like polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,natural killer $(NK)$ cells,and macrophages phagocytose and destroy microbes $(R-IV)$.$4$. Cytokine barriers: Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection $(S-III)$.Thus,the correct matching is $P-II, Q-I, R-IV, S-III$.

Column-$I$	Column-$II$
$P$. Physical barriers	$I$. Acid in stomach,saliva in mouth,tears from eyes
$Q$. Physiological barriers	$II$. Skin,mucus coating of epithelium lining the respiratory,gastrointestinal and urogenital tracts
$R$. Cellular barriers	$III$. Interferons
$S$. Cytokine barriers	$IV$. Polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,$NK$ cells,macrophages

List-$I$	List-$II$
$(a)$ $IgG$	$(i)$ Protection of body surfaces
$(b)$ $IgA$	$(ii)$ Regulation of allergic reactions
$(c)$ $IgM$	$(iii)$ Activates $B$-cells
$(d)$ $IgD$	$(iv)$ Protection of body fluids
$(e)$ $IgE$	$(v)$ Protection of blood circulation

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