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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Melatonin, which helps regulate the day-night (diurnal) rhythm, is secreted by the:
सही उत्तर: ख) Pineal gland
The pineal gland secretes melatonin, which influences sleep-wake cycles and body rhythms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hormone that stimulates contraction of uterine muscles during childbirth and ejection of milk is:
सही उत्तर: घ) Oxytocin
Oxytocin, released from the posterior pituitary, causes uterine contraction during parturition and milk ejection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The smallest bone in the human body is the:
सही उत्तर: क) Stapes
The stapes (stirrup), one of the three middle-ear ossicles, is the smallest bone of the body.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The part of the retina that contains only cones and gives the sharpest vision is the:
सही उत्तर: घ) Fovea centralis
The fovea, in the centre of the yellow spot, is packed with cones and is the point of greatest visual acuity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many pairs of cranial nerves and spinal nerves, respectively, are found in humans?
सही उत्तर: ग) 12 and 31
Humans have 12 pairs of cranial nerves and 31 pairs of spinal nerves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The band of nerve fibres that connects the right and left cerebral hemispheres is the:
सही उत्तर: ख) Corpus callosum
The corpus callosum is a thick band of commissural fibres joining the two cerebral hemispheres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The organ of Corti, the actual receptor organ of hearing, is located in the:
सही उत्तर: ख) Cochlea
The organ of Corti lies on the basilar membrane of the cochlea and contains hair cells that act as auditory receptors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The visual pigment present in the rod cells of the retina is:
सही उत्तर: क) Rhodopsin
Rods contain rhodopsin (visual purple), made of opsin and retinal, a derivative of vitamin A; cones contain iodopsin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resting membrane potential of a typical neuron is approximately:
सही उत्तर: ग) -70 mV
At rest the inside of the axon is about 70 mV negative relative to the outside, maintained largely by the Na+/K+ pump and K+ leak.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme renin, which starts the renin-angiotensin mechanism, is secreted by the:
सही उत्तर: घ) Juxtaglomerular cells
Juxtaglomerular cells of the afferent arteriole secrete renin when glomerular blood flow or pressure falls.
💬 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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