जीव विज्ञान – Zoology – Zoology MCQ
जीव विज्ञान – Zoology – CEE प्रवेश
Zoology · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०८ प्रश्न
४०८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान – Zoology: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Which vitamin deficiency causes night blindness?
सही उत्तर: घ) Vitamin A
Vitamin A is needed to form rhodopsin in rod cells, so its deficiency causes night blindness. Vitamin B1 deficiency causes beriberi.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Trypsinogen is activated in the small intestine by:
सही उत्तर: ग) Enterokinase
Enterokinase (enteropeptidase) from the intestinal mucosa converts trypsinogen to trypsin. Trypsin then activates other pancreatic zymogens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bile helps in digestion of fats mainly by:
सही उत्तर: ख) Emulsifying fats
Bile salts break large fat globules into small droplets (emulsification), increasing the surface for lipase. Bile itself contains no digestive enzyme.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Intrinsic factor secreted by the stomach is required for absorption of:
सही उत्तर: क) Vitamin B12
Intrinsic factor binds vitamin B12 and allows its absorption in the ileum; its lack causes pernicious anaemia. Iron absorption is aided by acidity, not intrinsic factor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which cells of the gastric glands secrete hydrochloric acid?
सही उत्तर: घ) Parietal (oxyntic) cells
Parietal cells secrete HCl and intrinsic factor. Chief cells secrete pepsinogen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pepsinogen is converted to active pepsin by:
सही उत्तर: ग) Hydrochloric acid
HCl secreted by oxyntic (parietal) cells activates pepsinogen to pepsin in the stomach. Enterokinase activates trypsinogen in the duodenum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme ptyalin (salivary amylase) acts on:
सही उत्तर: ख) Starch
Salivary amylase begins starch digestion in the mouth, converting it to maltose. Proteins are digested later in the stomach by pepsin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which cells form the myelin sheath in the peripheral nervous system?
सही उत्तर: क) Schwann cells
Schwann cells myelinate peripheral axons. Oligodendrocytes perform the same job in the central nervous system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Intercalated discs are found in:
सही उत्तर: घ) Cardiac muscle
Intercalated discs join cardiac muscle cells and allow impulses to pass quickly so the heart contracts as a unit. Skeletal muscle fibres are multinucleate syncytia without such discs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Haversian canals are a characteristic feature of:
सही उत्तर: ग) Compact bone of mammals
Haversian systems (osteons) with central canals carrying blood vessels are found in mammalian compact bone. Cartilage is avascular and has no Haversian canals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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