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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The bicuspid (mitral) valve is located between the:
सही उत्तर: घ) Left atrium and left ventricle
The mitral valve guards the left atrioventricular opening. The tricuspid valve lies between the right atrium and right ventricle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an ECG, the QRS complex represents:
सही उत्तर: ग) Ventricular depolarisation
The QRS complex reflects spread of depolarisation through the ventricles. The P wave represents atrial depolarisation and the T wave ventricular repolarisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'lub' sound of the heart is produced by:
सही उत्तर: ख) Closure of the atrioventricular valves
The first heart sound 'lub' is due to closure of the tricuspid and bicuspid valves at the start of ventricular systole. 'Dub' is caused by closure of the semilunar valves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person with blood group AB has which antibodies in the plasma?
सही उत्तर: क) Neither anti-A nor anti-B
AB individuals have both A and B antigens on RBCs and therefore no anti-A or anti-B antibodies; they are universal recipients. Group O has both antibodies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Erythroblastosis foetalis can occur when:
सही उत्तर: घ) An Rh-negative mother carries an Rh-positive foetus
Anti-Rh antibodies made by an Rh-negative mother (sensitised in a previous pregnancy) cross the placenta and destroy Rh-positive foetal RBCs. It is prevented by giving anti-D immunoglobulin to the mother.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which ion is essential for blood coagulation?
सही उत्तर: ग) Calcium
Ca2+ (clotting factor IV) is required at several steps of the coagulation cascade. That is why citrate or oxalate, which remove calcium, prevent clotting of stored blood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conversion of fibrinogen into fibrin during clotting is catalysed by:
सही उत्तर: ख) Thrombin
Thrombin, formed from prothrombin, converts soluble fibrinogen to insoluble fibrin threads. Plasmin breaks down fibrin, dissolving clots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which plasma protein is mainly responsible for maintaining colloid osmotic pressure of blood?
सही उत्तर: क) Albumin
Albumin is the most abundant plasma protein and the main contributor to oncotic pressure. Fibrinogen and prothrombin are clotting factors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The life span of a normal human RBC is about:
सही उत्तर: घ) 120 days
Human erythrocytes live about 120 days before being destroyed mainly in the spleen. The spleen is therefore called the 'graveyard of RBCs'.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which blood cells are the most numerous among leucocytes in a healthy adult?
सही उत्तर: ग) Neutrophils
Neutrophils form about 60-65% of total WBCs and are the main phagocytes in acute infection. Lymphocytes are the second most numerous.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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