عُشــّٓاقـُــ الـْطــّبــ

Which fixative is most commonly used in routine paraffin section preparation? a) Glutaraldehyde b) 10% Formalin c) Osmium tetroxide d) Absolute alcohol

What is the main purpose of the "Clearing" step in paraffin preparation? a) To prevent autolysis b) To replace water with alcohol c) To replace alcohol with organic solvents making tissue translucent

To prepare whole-organ specimens such as an entire eyeball without using heat, which method is best? a) Paraffin section b) Cryosection c) Celloidin section d) Resin embedding

Which special stain is specifically used to demonstrate elastic fibers in vascular walls? a) Silver stain b) Orcein stain c) PAS stain d) Sudan III

In H&E staining, Hematoxylin is a base (+) dye that binds to which of the following? a) Mitochondria b) Collagen fibers c) Nucleus (DNA & RNA) d) Cytoplasmic proteins

Which microtechnique is most suitable for preserving lipids and getting rapid intraoperative results? a) Celloidin embedding b) Frozen section (Cryostat) c) Paraffin embedding d) Electron microscopy

The neck of the mature sperm extends up to the: A) Posterior centriole B) Anterior centriole C) Acrosome D) End piece of tail

Sperms become actively motile after being deposited into the: A) Seminiferous tubules B) Vas deferens C) Vagina / Female genital tract D) Mediastinum testis

In the male genital tract (e.g., testes and epididymis), sperms are generally: A) Motile B) Non-motile C) Fully fertilized D) Non-viable

The mitochondrial helical sheath is concentrated in which structural region of the sperm? A) Head B) Neck C) Middle part (body) D) Tail end

The axial fibrils of the sperm flagellum originate from the: A) Acrosome B) Basal body (derived from the posterior centriole) C) Golgi apparatus D) Mitochondrial sheath

The nucleus of the spermatid condenses to form which part of the mature sperm? A) Tail B) Middle piece C) Head D) Neck

During spermatogenesis, the division that converts a primary spermatocyte into two secondary spermatocytes is: [A] Mitotic division [B] Meiosis I (Reduction division) [C] Meiosis II [D] Spermiogenesis

In a normal fertile male, the percentage of abnormal sperms should NOT exceed: A) 1–2% B) 5% C) 10–20% D) 50%

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