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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Which organ is known as the 'graveyard of red blood cells'?
सही उत्तर: ख) Spleen
Old and worn-out red blood cells are destroyed mainly in the spleen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During blood clotting, the enzyme thrombin converts:
सही उत्तर: ख) Fibrinogen into fibrin
Thrombin acts on soluble fibrinogen to form insoluble fibrin threads that trap blood cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person with which blood group is called a 'universal recipient'?
सही उत्तर: घ) AB positive
AB+ blood has no anti-A, anti-B or anti-Rh antibodies, so it can receive red cells of any ABO and Rh type.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bilirubin, a pigment of bile, is formed from the breakdown of:
सही उत्तर: घ) Haemoglobin
When old red blood cells are destroyed, the haem of haemoglobin is converted to biliverdin and bilirubin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pepsinogen in the human stomach is secreted by the:
सही उत्तर: ग) Chief (peptic) cells
Chief cells of the gastric glands secrete pepsinogen, the inactive precursor of pepsin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The synthetic auxin 2,4-D is widely used as a:
सही उत्तर: ख) Weedicide that kills broad-leaved (dicot) weeds
2,4-D (2,4-dichlorophenoxyacetic acid) selectively kills dicot weeds and spares cereal (monocot) crops.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In phototropism, a stem bends towards light because auxin:
सही उत्तर: क) Accumulates on the shaded side and causes faster cell elongation there
Auxin moves to the shaded side, cells there elongate more, so the stem curves toward light.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which micronutrient is a component of the enzyme nitrogenase?
सही उत्तर: घ) Molybdenum
Nitrogenase is a molybdenum-iron protein, so molybdenum is essential for biological nitrogen fixation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bacteria such as Pseudomonas that reduce soil nitrate to free nitrogen gas carry out:
सही उत्तर: क) Denitrification
Denitrification returns nitrogen from nitrate to the atmosphere as N2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conversion of ammonia into nitrite in the soil is carried out by:
सही उत्तर: घ) Nitrosomonas
Nitrosomonas oxidises ammonia to nitrite; Nitrobacter then oxidises nitrite to nitrate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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