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STD 11 - 19. Chemical coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 19. Chemical coordination and integration1 Mark
MCQ
Damage to thymus in a child may lead to
  • A
    $A$ reduction in haemoglobin content of blood.
  • B
    $A$ reduction in stem cell production.
  • C
    Loss of antibody- mediated immunity
  • ✓
    Loss of cell- mediated immunity.
✓

Answer

Correct option: D.
Loss of cell- mediated immunity.
d
Thymus gland secretes thymosin hormone, thymic humoral factor, thymic factor and thymopoietin. Proliferation of lymphocytes and differentiation of these lymphocytes into a variety of clones are induced by these factors. These clones are differentially specialized to destroy different specific category of antigens and pathogens. Thus, thymus gland brings fourth $T$- lymphocytes for cell mediated immunity.

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