With regard to secondary lymphatic nodules: They form following 'antigen-independent differentiation'.

Correct Answer: B

Rationale: Secondary lymphatic nodules form following antigen-dependent differentiation, not antigen-independent, which occurs in primary lymphoid organs like the thymus.

Correct Answer: B

Rationale: Lymphatic nodules are non-capsulated lymphocyte aggregations; diffuse lymphocytes are scattered, not aggregated.

Correct Answer: C

Rationale: Splenic cords (Billroth cords) lie between white pulp and blood sinusoids, containing lymphoid cells.

Correct Answer: A

Rationale: Thymus cortex contains lymphoblasts (immature) externally and mature T-lymphocytes internally.

Correct Answer: D

Rationale: Palatine tonsils have nodules and diffuse tissue ; they're in the oropharynx (not nasopharynx, A), non-keratinized , glands open at crypt surfaces (C is incorrect).