जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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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The movement of chloride ions into red blood cells in exchange for bicarbonate ions moving out is known as:
सही उत्तर: ख) Chloride shift (Hamburger phenomenon)
As HCO3- diffuses out of RBCs into plasma, Cl- enters to maintain electrical neutrality; this is the chloride or Hamburger shift.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The volume of air that remains in the lungs even after a maximal forced expiration is called the:
सही उत्तर: घ) Residual volume
Residual volume is the air that cannot be exhaled even by forcible expiration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The respiratory rhythm centre that controls normal breathing is located in the:
सही उत्तर: क) Medulla oblongata
The respiratory rhythm centre lies in the medulla oblongata; the pneumotaxic centre in the pons modifies it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pulmonary surfactant, which lowers surface tension in the alveoli, is secreted by:
सही उत्तर: ग) Type II alveolar cells
Type II pneumocytes secrete surfactant (mainly lecithin), which prevents alveoli from collapsing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first hormone ever discovered, by Bayliss and Starling in 1902, was:
सही उत्तर: घ) Secretin
Bayliss and Starling discovered secretin, which stimulates the pancreas to release bicarbonate-rich juice; they also coined the idea of hormones.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hormone that stimulates contraction of the gall bladder and release of pancreatic enzymes is:
सही उत्तर: ख) Cholecystokinin (CCK)
Cholecystokinin (pancreozymin) from the duodenum stimulates gall bladder contraction and enzyme-rich pancreatic juice.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dental formula of an adult human is:
सही उत्तर: क) 2123/2123
Each half of each jaw has 2 incisors, 1 canine, 2 premolars and 3 molars, giving 32 teeth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kupffer cells, which are phagocytic macrophages, are found in the:
सही उत्तर: घ) Liver
Kupffer cells line the sinusoids of the liver and engulf old blood cells and bacteria.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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After absorption in the small intestine, fatty acids and glycerol (as chylomicrons) enter the:
सही उत्तर: ख) Lacteals of the villi
Digested fats are re-formed into chylomicrons and enter the lymph vessels (lacteals) of the villi.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Absorption of vitamin B12 from the intestine requires:
सही उत्तर: क) Castle's intrinsic factor
Intrinsic factor secreted by gastric parietal cells binds vitamin B12 and enables its absorption in the ileum; its lack causes pernicious anaemia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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