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 nervous system and epidermis of a vertebrate embryo develop from the:
सही उत्तर: ग) Ectoderm
Ectoderm gives rise to the epidermis, brain, spinal cord and nerves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many functional ova are produced from one primary oocyte at the end of oogenesis?
सही उत्तर: क) One
Meiosis of one primary oocyte gives one ovum and polar bodies, whereas one primary spermatocyte yields four sperms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hormone detected in urine in a routine pregnancy test is:
सही उत्तर: घ) Human chorionic gonadotropin (hCG)
hCG is secreted by the trophoblast/placenta soon after implantation and is the basis of pregnancy tests.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ovulation in the human menstrual cycle is triggered by a mid-cycle surge of:
सही उत्तर: ख) LH (luteinising hormone)
A sharp LH surge around day 14 causes rupture of the Graafian follicle and release of the secondary oocyte.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The acrosome of a sperm, containing enzymes for penetrating the ovum, is derived from the:
सही उत्तर: ग) Golgi apparatus
The acrosome is formed from the Golgi apparatus during spermiogenesis and contains hydrolytic enzymes such as hyaluronidase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the testes, FSH acts mainly on which cells to support spermatogenesis?
सही उत्तर: क) Sertoli cells
FSH acts on Sertoli cells, which nourish developing sperm and secrete factors that help spermiogenesis; LH acts on Leydig cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Adrenaline and noradrenaline, the 'fight or flight' hormones, are secreted by the:
सही उत्तर: घ) Adrenal medulla
The adrenal medulla secretes catecholamines (adrenaline and noradrenaline) during emergencies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Calcitonin, a hormone that lowers blood calcium, is secreted by the:
सही उत्तर: ख) Parafollicular (C) cells of the thyroid
Calcitonin (thyrocalcitonin) is produced by the parafollicular C cells of the thyroid and opposes parathormone.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess secretion of growth hormone in an adult, after the growth plates have closed, causes:
सही उत्तर: ग) Acromegaly
In adults, excess GH enlarges bones of the face, hands and feet (acromegaly); in children it causes gigantism.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Addison's disease is caused by:
सही उत्तर: क) Hyposecretion of hormones of the adrenal cortex
Addison's disease results from deficient secretion of adrenal cortical hormones (glucocorticoids and mineralocorticoids), causing weakness, low BP and bronzed skin.
💬 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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