What is immunity based on?

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(D) Immunity is the ability of the host to fight against disease-causing organisms,conferred by the immune system. It is primarily based on the 'memor

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Memory of the immune system

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(D) Immunity is the ability of the host to fight against disease-causing organisms,conferred by the immune system. It is primarily based on the 'memory' of the immune system. When the immune system encounters a pathogen for the first time,it produces a primary response of low intensity. Subsequent encounters with the same pathogen elicit a highly intensified secondary or anamnestic response due to the memory of the first encounter.

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

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