| Column-$I$ | Column-$II$ |
| $1.$ Saliva and tears | $a.$ Cytokine barrier |
| $2.$ Mucus coating | $b.$ Cellular barrier |
| $3.$ $PMNL$ | $c.$ Physiological barrier |
| $4.$ Interferons | $d.$ Physical barrier |
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| 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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