What is the role of tonsils in immunity?

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A. Mature T cells B. Filter blood C. Trap pathogens D. Produce antibodies

Correct Answer: C

Rationale: Tonsils trap pathogens; T cells are thymus, blood is spleen, antibodies are B cells.

Give the two main functions of this organ.

A. Immunological and haematopoeitic B. Lymph filtration and storage C. T-cell education D. Phagocytosis only

Correct Answer: A

Rationale: The spleen's main functions are immunological (lymphocyte activity) and hematopoietic (blood cell production/filtering).

reticular CT can be stained by

A. eosin B. silver C. Janus green D. hematoxylin

Correct Answer: B

Rationale: Reticular connective tissue (C.T.) is stained with silver to highlight fibers; eosin stains cytoplasm, hematoxylin stains nuclei.

Contain B. T lymphocyte

A. follicular zone B. germinal zone C. PALS D. marginal zone

Correct Answer: D

Rationale: The marginal zone in white pulp contains both B- and T-lymphocytes.

origin of T-lymphocyte

A. ectodermal B. mesodermal C. endodermal D. none of above

Correct Answer: B

Rationale: T-lymphocytes originate from mesodermal bone marrow stem cells.

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