Read the following passage and answer the question :
The primary lymphoid organs are bone marrow and thymus, where immature lymphocytes differentiate into antigen sensitive lymphocytes. They migrate to secondary lymphoid organ like spleen, lymph nodes, tonsils, Peyer’s patches of small intestine and appendix. All blood cells including lymphocytes are produced in bone marrow which is main lymphoid organ. Spleen is large reservoir of erythrocytes. It is large bean shaped organ mainly containing lymphocyte and phagocyte. It acts as filter of blood by trapping blood borne micro organism. Lymph nodes are small solid structures located at different points along lymphatic system. Antigens trapped in lymph node are responsible for activation of lymphocytes present there and cause the immune response. There is lymphoid tissue located within. Lining of major tracts like respiratory, digestive and urogenital tracts called mucous associated lymphoid tissue (MALT).
Mucous associated lymphoid tissue (MALT) is NOT found in:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Spleen
MALT (mucosa-associated lymphoid tissue) is lymphoid tissue in the lining of the major tracts of the body. It forms about 50 per cent of the lymphoid tissue.
Option (1) Urinogenital tract — MALT is found here.
Option (2) Digestive tract — MALT is found here.
Option (3) Spleen — MALT is not found here. The spleen is a separate bean-shaped secondary lymphoid organ that filters the blood; it is not the lining of a tract.
Option (4) Respiratory tract — MALT is found here.
Note: The passage is taken from NCERT. NTA has put lines of the NCERT text together to make it. Most CUET (UG) questions come straight from NCERT, so study the book line by line, including figures and their titles.