(A) An antibody,also known as an immunoglobulin $(Ig)$,is a large,$Y$-shaped protein produced by plasma cells (differentiated $B$-lymphocytes).Its pri

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Molecule that specifically inactivates an antigen

(A) An antibody,also known as an immunoglobulin $(Ig)$,is a large,$Y$-shaped protein produced by plasma cells (differentiated $B$-lymphocytes).Its primary function is to identify and neutralize foreign objects such as bacteria and viruses.Antibodies specifically bind to unique molecules on the surface of pathogens,known as antigens,thereby inactivating them or marking them for destruction by other immune cells.

Class 12 Biology Human Health and Disease Immunity

Medium

An antibody is

A
Molecule that specifically inactivates an antigen
B
$WBC$ which invades bacteria
C
Secretion of mammalian $RBC$
D
Component of blood

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Class 12

Biology Questions

Chapter

Human Health and Disease

Subtopic

Immunity

Match List-$I$ with List-$II$ :

List-$I$ List-$II$

$a$. Cellular barrier $i$. Interferons

$b$. Cytokine barrier $ii$. Mucus

$c$. Physical barrier $iii$. Neutrophils

$d$. Physiological barrier $iv$. $HCl$ in gastric juice

Choose the correct answer from the options given below:

List-$I$	List-$II$
$a$. Cellular barrier	$i$. Interferons
$b$. Cytokine barrier	$ii$. Mucus
$c$. Physical barrier	$iii$. Neutrophils
$d$. Physiological barrier	$iv$. $HCl$ in gastric juice

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Which group of cells acts as phagocytes?

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Identify the correct statement$(s)$ regarding the human immune system.

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Which of the following statements is correct regarding antibodies?

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Match the type of immunity listed in Column-$I$ with the examples listed in Column-$II$. Choose the answer that gives the correct combination of alphabets of the two columns:
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

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