Which of the following glands is large-sized at birth but reduces in size with ageing?
1. Pineal
2. Pituitary
3. Thymus
4. Thyroid
| 1. | Both primary and secondary lymphoid organs produce lymphocytes. |
| 2. | The spleen and thymus are both primary lymphoid organs. |
| 3. | Primary lymphoid organs are where lymphocytes mature and become functional, whereas secondary lymphoid organs are where they interact with antigens. |
| 4. | Bone marrow and lymph nodes are both considered secondary lymphoid organs. |
Acid in stomach, saliva in the mouth, tears from eyes, all prevent microbial growth belong to which of the following barrier?
1. Physical barrier
2. Physiological barrier
3. Cellular barrier
4. Cytokine barrier
| 1. | Bone marrow | Primary lymphoid organ |
| 2. | Thymus | Increases in size after puberty |
| 3. | Payer’s patches | Present in small intestine and appendix |
| 4. | Spleen | Has a large reservoir of RBCs |
Which of the following lymphoid organs is not included in secondary lymphoid organs?
| 1. | Peyer's patches of small intestine |
| 2. | Spleen |
| 3. | Tonsils |
| 4. | Thymus |
MALT constitutes about ___________ percent of the lymphoid tissue in human body
(1) 50% (2) 20% (3) 70% (4) 10%
| Statement A: | Acquired immunity is pathogen-specific. |
| Statement B: | Acquired immunity is present at birth. |
| 1. | Both A and B are correct |
| 2. | A is correct but B is incorrect |
| 3. | A is incorrect but B is correct |
| 4. | Both A and B are incorrect |
Identify the incorrect statement
| 1. | Acquired immune response is a highly specific immune response |
| 2. | Acquired immune response is due to lymphocytes |
| 3. | Acquired immune system cannot differentiate between self and non-self antigens |
| 4. | Acquired immunity is characterized by development of memory |