(A) $IgA$ is the primary immunoglobulin found in human milk,particularly in colostrum. It provides passive immunity to the infant by protecting the mu

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(A) $IgA$ is the primary immunoglobulin found in human milk,particularly in colostrum. It provides passive immunity to the infant by protecting the mucosal surfaces of the gastrointestinal tract from pathogens. While $IgG$ is the most abundant immunoglobulin in human serum,$IgA$ is the predominant antibody in secretions,including breast milk.

Class 12 Biology Human Health and Disease Immunity

Medium

Which of the following immunoglobulins constitutes the largest percentage in human milk?

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A
$IgA$
B
$IgG$
C
$IgD$
D
$IgM$

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Human Health and Disease

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Immunity

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Interferons are the protein molecules produced from the

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Which is the main physical barrier in our body?

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Match the following columns:

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

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