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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Under normal resting conditions, every 100 mL of oxygenated blood delivers about how much oxygen to the tissues?
सही उत्तर: ख) 5 mL
100 mL of oxygenated blood carries about 20 mL O₂, of which about 5 mL is given up to the tissues at rest.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The partial pressures of oxygen and carbon dioxide in human alveolar air are about:
सही उत्तर: ख) pO₂ 104 mm Hg and pCO₂ 40 mm Hg
Alveolar air has pO₂ ≈ 104 mm Hg and pCO₂ ≈ 40 mm Hg; atmospheric air has pO₂ ≈ 159 and tissues have pO₂ ≈ 40, pCO₂ ≈ 45.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During normal inspiration in humans, the diaphragm:
सही उत्तर: घ) contracts and becomes flatter
Contraction flattens the diaphragm, increasing the volume of the thoracic cavity so that air flows into the lungs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The expiratory reserve volume (ERV) of a healthy adult human is about:
सही उत्तर: क) 1000–1100 mL
ERV, the extra air that can be forcibly expired after a normal expiration, is about 1000–1100 mL; 500 mL is the tidal volume.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Emphysema, a chronic lung disorder common in cigarette smokers, involves:
सही उत्तर: घ) damage to alveolar walls, reducing the respiratory surface
In emphysema the alveolar walls break down, so the gas-exchange surface decreases; smoking is a major cause.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme that rapidly converts CO₂ and water into carbonic acid inside red blood cells is:
सही उत्तर: घ) carbonic anhydrase
Carbonic anhydrase in RBCs speeds up CO₂ + H₂O ⇌ H₂CO₃, which then dissociates to HCO₃⁻ and H⁺.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gastrin, a hormone secreted by the stomach, mainly:
सही उत्तर: ख) stimulates the secretion of gastric juice (HCl and pepsinogen)
Gastrin, released by G cells of the pyloric stomach, stimulates gastric glands to secrete HCl and pepsinogen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In jaundice, the skin and eyes turn yellow because of the deposition of:
सही उत्तर: क) bile pigments (bilirubin)
When the liver is affected or bile flow is blocked, bilirubin accumulates in the blood and is deposited in the skin and sclera.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kwashiorkor, seen in children with a swollen belly and oedema, is caused mainly by deficiency of:
सही उत्तर: ग) proteins
Kwashiorkor results from a diet low in protein (often with adequate calories), common after weaning on starchy foods.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme lipase acts on fats and converts them into:
सही उत्तर: ग) fatty acids and glycerol (via monoglycerides)
Lipase hydrolyses triglycerides, mainly in the small intestine, into fatty acids, monoglycerides and glycerol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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