The process of spermiogenesis refers to: MCQ with Answer and Explanation

Question
The process of spermiogenesis refers to:
A. The release of spermatozoa from the seminiferous tubules into the lumen
B. The formation of spermatogonia from stem cells
C. The transformation of spermatids into mature, motile spermatozoa
D. The meiotic division of primary spermatocytes to form spermatids
Answer: Option C
Solution (By JKSSB Mock Tests)
Spermiogenesis is the final stage of spermatogenesis, where the spherical, non-motile spermatids undergo a complex morphological transformation to become highly specialized, motile spermatozoa (sperm). This involves the formation of the acrosome, condensation of the nucleus, development of the flagellum (tail), and the shedding of excess cytoplasm. Spermiation is the subsequent release of these mature sperm into the tubule lumen.
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Question #1
Which of the following vitamins is required for the synthesis of collagen?
A. Vitamin C
B. Vitamin K
C. Vitamin D
D. Vitamin A
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Correct Answer: Option A

Explanation:
Vitamin C (ascorbic acid) is a cofactor for prolyl and lysyl hydroxylase enzymes that hydroxylate proline and lysine in collagen synthesis, necessary for stabilizing collagen triple helix. Deficiency leads to impaired collagen formation, causing scurvy—fragile blood vessels, bleeding gums, poor wound healing. Vitamin A is for vision, D for bone, K for clotting.
This question belongs to: Science Biology
Question #2
Identify the INCORRECT statement about the respiratory system:
A. Surfactant reduces surface tension in alveoli.
B. The diaphragm is the primary muscle of inspiration.
C. The trachea is lined with ciliated epithelium.
D. The right lung has two lobes.
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Correct Answer: Option D

Explanation:
The right lung has three lobes, the left has two (to accommodate the heart). So C is incorrect.
This question belongs to: Science Biology
Question #3
The 'Hormone Cholecystokinin' (CCK) is secreted by the I cells of the duodenal mucosa in response to the presence of fats and proteins. Its primary actions include:
A. Inhibiting the release of bile
B. Stimulating gastric acid secretion
C. Inhibiting gastric emptying and stimulating the gall bladder to contract and the pancreas to secrete digestive enzymes
D. Increasing blood glucose levels
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Correct Answer: Option C

Explanation:
Cholecystokinin (CCK) is a peptide hormone released by the I cells of the duodenum when acidic chyme containing fats (lipids) and partially digested proteins enters from the stomach. CCK has two major digestive actions: 1) It stimulates the gall bladder to contract, releasing stored bile into the duodenum to emulsify fats. 2) It stimulates the pancreatic acinar cells to secrete a juice rich in digestive enzymes (lipases, proteases, amylase). It also slows down gastric emptying, allowing more time for digestion in the small intestine.
This question belongs to: Science Biology
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