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 normal glomerular filtration rate (GFR) in a healthy adult is about:
सही उत्तर: क) 125 mL per minute
About 125 mL of filtrate is formed per minute, i.e. roughly 180 litres per day, most of which is reabsorbed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In humans, urea is synthesised from ammonia in the:
सही उत्तर: ख) Liver
Urea is formed in the liver through the ornithine (urea) cycle and is then removed by the kidneys.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Animals such as birds, reptiles and insects that excrete nitrogenous waste mainly as uric acid are called:
सही उत्तर: ग) Uricotelic
Uricotelic animals excrete uric acid, which needs very little water; this conserves water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hepatic portal vein carries blood from the:
सही उत्तर: घ) Intestine to the liver
The hepatic portal vein carries nutrient-rich blood from the digestive tract to the liver before it reaches systemic circulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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With a stroke volume of about 70 mL and a heart rate of about 72 per minute, the cardiac output of a healthy adult is approximately:
सही उत्तर: ग) 5 litres per minute
Cardiac output = stroke volume x heart rate = 70 mL x 72 ≈ 5040 mL, about 5 L per minute.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first heart sound 'lub' is produced by the closure of the:
सही उत्तर: ख) Atrioventricular (tricuspid and bicuspid) valves
'Lub' comes from closure of the AV valves at the start of ventricular systole; 'dub' from closure of the semilunar valves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Blood platelets (thrombocytes) are fragments of:
सही उत्तर: क) Megakaryocytes
Platelets are cell fragments produced from large megakaryocytes in the bone marrow.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant type of white blood cell in normal human blood is the:
सही उत्तर: घ) Neutrophil
Neutrophils make up about 60-65% of total leucocytes and are the main phagocytes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Erythroblastosis foetalis can occur when:
सही उत्तर: ग) An Rh-negative mother carries an Rh-positive foetus in a later pregnancy
An Rh-negative mother sensitised by an earlier Rh-positive child makes anti-Rh antibodies that cross the placenta and destroy the foetal RBCs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The oxygen-haemoglobin dissociation curve shifts to the right when:
सही उत्तर: क) Blood pCO2 and H+ concentration increase
Higher pCO2, H+ (lower pH) and temperature reduce haemoglobin's affinity for O2, shifting the curve right (Bohr effect) and favouring O2 release to tissues.
💬 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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