Question

Match the following:

$\begin{array}{cc}\text{Column A}& \text{Column B}\\ \text{1. Bone marrow}& \text{p. Secondary lymphoid organ}\\ \text{2. Lymph nodes}& \text{q. Antibody production}\\ \text{3. IgE}& \text{r. Primary lymphoid organ}\\ \text{4. B-lymphocytes}& \text{s. Allergic responses}\end{array}$

• A. 1-q, 2-p, 3-s, 4-r
• B. 1-r, 2-p, 3-q,4-s
• C. 1-r, 2-p, 3-s, 4-q
• D. 1-s, 2-r, 3-q, 4-p

Answer 1

The correct option is C 1-r, 2-p, 3-s, 4-q

Immunity is the ability of an organism to protect itself against any foreign antigen that enters the body.
Lymphocytes are a type of white blood cells with non-granular cytoplasm that are mainly found in the lymph. They can provide immunity against specific antigens by producing antibodies against them or by generating cells which have phagocytic ability (ability to engulf particles and digest them). The plasma cells or B-lymphocytes produce antibodies which bind to the antigens, and eliminate them by various means.


Primary lymphoid organs are certain specialised organs made up of lymphoid tissues that can act as sites for production and maturation of lymphocytes, for example, bone marrow and thymus.

Lymph nodes are junctions which connect the lymphatic vessels through which lymph flows. These act as secondary lymphoid organs as they serve as sites which trap antigens from the lymph and allow the mature lymphocytes to bind to these antigens.

Five different classes of antibodies are produced in the body, namely, IgA, IgG, IgM, IgE and IgD. IgE is mainly found in the mucous membranes, skin and lungs. It triggers allergic responses on contact with antigens.

Thus the correctly matched pairs are -
$\begin{array}{cc}\text{Column A}& \text{Column B}\\ \text{1. Bone marrow}& \text{r. Primary lymphoid organ}\\ \text{2. Lymph nodes}& \text{p. Secondary lymphoid organ}\\ \text{3. IgE}& \text{s. Allergic responses}\\ \text{4. B lymphocytes}& \text{q. Antibody production}\end{array}$