‘Pathogens' are

  • A

    Substances produced against any disease causative

  • B

    Chemical substances produced by the host cells to kill the parasite animal

  • C

    Disease spreading factors

  • D

    Cells which kill the parasites

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Lymphocytes are seen in large numbers at sites of inflammation because

Select the incorrect statement with respect to acquired immunity.

  • [NEET 2022]

Thymus is the site for the development and maturation of

Match the following columns

Column $-I$ Column $-II$
$(A)$ Physical barriers $(1)$ Interferon
$(B)$ Physiological barriers $(2)$ Leukocytes
$(C)$ Cellular barriers $(3)$ Tears
$(D)$ Cytokinin barriers $(4)$ skin

$A$    $B$    $C$    $D$

Write in details about Thymus.