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(B) The immune system consists of various types of lymphocytes that perform specific functions.$T$-lymphocytes (or $T$-cells) are responsible for cell

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Killer $T$-cells

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(B) The immune system consists of various types of lymphocytes that perform specific functions.$T$-lymphocytes (or $T$-cells) are responsible for cell-mediated immunity.Among these,Killer $T$-cells (also known as Cytotoxic $T$-cells) are specialized cells that directly recognize,attack,and destroy infected host cells or foreign antigens.Helper $T$-cells,on the other hand,primarily function by secreting cytokines to activate other immune cells like $B$-cells and macrophages,rather than directly destroying antigens themselves.$B$-cells are primarily involved in humoral immunity by producing antibodies.

Column-$I$	Column-$II$
$(a)$ Main lymphoid organ	$(1)$ Thymus
$(b)$ $MALT$	$(2)$ Spleen
$(c)$ Lobe-like organ arranged near heart	$(3)$ Bone marrow
$(d)$ Large bean-shaped organ	$(4)$ It constitutes $50\%$ of lymphoid tissue

The cells which directly attack and destroy the antigens are known as

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Match the columns:

Column-$I$ Column-$II$

$(a)$ Main lymphoid organ $(1)$ Thymus

$(b)$ $MALT$ $(2)$ Spleen

$(c)$ Lobe-like organ arranged near heart $(3)$ Bone marrow

$(d)$ Large bean-shaped organ $(4)$ It constitutes $50\%$ of lymphoid tissue

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