Mucosa associated lymphoid tissue constitutes ________ % of lymphoid…

The correct answer is Option (4) → 50%

Lymphoid tissue is the tissue in which lymphocytes live and respond to antigens. Besides the lymphoid organs such as the thymus, spleen and lymph nodes, lymphoid tissue is also found in the lining of the major tracts of the body: the respiratory, digestive and urogenital tracts. This lining is the first place where many pathogens enter, so a large share of the body’s lymphoid tissue sits there.

NCERT Extract:
Immune System in the Body – “… After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer’s patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. … There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). It constitutes about 50 per cent of the lymphoid tissue in human body.”