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(C) Lymphoid organs are the organs where origin,maturation,and proliferation of lymphocytes occur. $1$. Primary lymphoid organs (like bone marrow and

Vedclass · Accepted Answer

Site of origin of antibodies.

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(C) Lymphoid organs are the organs where origin,maturation,and proliferation of lymphocytes occur. $1$. Primary lymphoid organs (like bone marrow and thymus) are sites where lymphocytes originate and mature. $2$. Secondary lymphoid organs (like spleen,lymph nodes,tonsils,Peyer's patches,and appendix) provide the sites for interaction of lymphocytes with antigens,which then proliferate to become effector cells. $3$. Antibodies are produced by plasma cells (differentiated $B$-lymphocytes) in response to antigens,but the lymphoid organs themselves are not the 'site of origin' of antibodies; rather,they are the sites where the immune response is initiated. Therefore,option $C$ is the correct answer as it is not a primary function or definition associated with lymphoid organs.

Column-$I$ (Types of immunity)	Column-$II$ (Example)
$A$. Natural active	$p$. Immunity developed by heredity
$B$. Artificial passive	$q$. From mother to foetus through placenta
$C$. Artificial active	$r$. Injection of antiserum to travellers
$D$. Natural passive	$s$. Fighting infections naturally
	$t$. Induced by vaccination

Which of the following is $NOT$ associated with lymphoid organs?

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