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

Question
The process of spermiogenesis refers to:
A. The meiotic division of primary spermatocytes to form spermatids
B. The formation of spermatogonia from stem cells
C. The release of spermatozoa from the seminiferous tubules into the lumen
D. The transformation of spermatids into mature, motile spermatozoa
Answer: Option D
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
The organelle that contains its own DNA and ribosomes and is involved in apoptosis is the:
A. Mitochondria
B. Endoplasmic reticulum
C. Peroxisome
D. Lysosome
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Correct Answer: Option A

Explanation:
Mitochondria release cytochrome c and other factors that activate caspases, initiating apoptosis. They have circular DNA and 70S ribosomes.
This question belongs to: Science Biology
Question #2
Which of the following statements about viruses is INCORRECT?
A. They are obligate intracellular parasites.
B. They can have either DNA or RNA as genetic material.
C. They reproduce by binary fission.
D. They lack metabolic machinery.
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Correct Answer: Option C

Explanation:
Viruses do not reproduce by binary fission; they replicate by hijacking host cell machinery. Binary fission is a method of asexual reproduction in bacteria. All other statements are correct.
This question belongs to: Science Biology
Question #3
The organelle that contains enzymes for intracellular digestion is the:
A. Lysosome
B. Chloroplast
C. Mitochondria
D. Peroxisome
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Correct Answer: Option A

Explanation:
Lysosomes are membrane-bound vesicles packed with hydrolytic enzymes (proteases, lipases, nucleases) that digest macromolecules, old organelles, and engulfed pathogens. They maintain an acidic pH (about 5.0) for optimal enzyme activity. Peroxisomes detoxify peroxides, mitochondria generate ATP, chloroplasts perform photosynthesis.
This question belongs to: Science Biology
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