Topics:
Animal Physiology, Animal Refresher
Match: Immunology Concepts
View Complete Answer & Explanation
Question (English)
Match the column:
| TABLE-I | TABLE-II |
|---|---|
| 1) Bone marrow | a) Secretory antibody |
| 2) Spleen | b) Cross the placenta |
| 3) IgG | c) Active immunity |
| 4) IgA | d) Passive immunity |
| 5) Vaccination | e) Secondary lymphoid organ |
| 6) Colostrum | f) Primary lymphoid organ |
- 1-f, 2-e, 3-b, 4-a, 5-c, 6-d ✓ Correct
- 1-e, 2-f, 3-b, 4-a, 5-c, 6-d
- 1-f, 2-e, 3-a, 4-b, 5-c, 6-d
- 1-f, 2-e, 3-b, 4-a, 5-d, 6-c
Explanation:
Correct Answer: 1-f, 2-e, 3-b, 4-a, 5-c, 6-d
Explanation of Each Match
- 1-f) Bone marrow → Primary lymphoid organ: Bone marrow is where B-lymphocytes and all blood cells originate and mature. It is a primary lymphoid organ (also includes thymus and bursa of Fabricius in birds).
- 2-e) Spleen → Secondary lymphoid organ: The spleen is a secondary lymphoid organ where mature lymphocytes encounter and respond to antigens. Other secondary lymphoid organs: lymph nodes, tonsils, Peyer's patches.
- 3-b) IgG → Crosses the placenta: IgG is the only immunoglobulin that can cross the placenta (via FcRn receptors on placental cells), providing natural passive immunity to the newborn. It is also the most abundant (80% of total Ig).
- 4-a) IgA → Secretory antibody: IgA is found in secretions (tears, saliva, sweat, colostrum, intestinal juice, mucus) and is therefore called the 'secretory antibody.' It protects mucosal surfaces.
- 5-c) Vaccination → Active immunity: Vaccination stimulates the body's own immune cells to produce antibodies = Artificial active immunity. The body becomes actively involved in producing its own defense.
- 6-d) Colostrum → Passive immunity: Colostrum (first milk) contains maternal IgG and IgA. When consumed by neonates, they receive ready-made antibodies = Natural passive immunity.
