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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During early development, the solid ball of 8–16 blastomeres formed by cleavage of the human zygote is called the:
सही उत्तर: ख) morula
Mitotic cleavage forms a solid mass of 8–16 cells, the morula, which then develops into the hollow blastocyst.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following hormones is produced in a woman only during pregnancy?
सही उत्तर: ग) Human placental lactogen (hPL)
hCG and hPL are made by the placenta only during pregnancy; oestrogen, progesterone and prolactin are also produced in non-pregnant women.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The middle piece of a human sperm contains numerous:
सही उत्तर: ख) mitochondria, which supply energy for movement
Mitochondria in the middle piece produce ATP that powers the beating of the tail.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One primary spermatocyte, after completing meiosis and spermiogenesis, gives rise to:
सही उत्तर: ग) four spermatozoa
Meiosis of a primary spermatocyte produces four haploid spermatids, each of which differentiates into a sperm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Oxytocin and vasopressin (ADH) are released from the posterior pituitary, but they are actually synthesised in the:
सही उत्तर: क) hypothalamus
Neurosecretory cells of the hypothalamus make these hormones; they travel down axons to the neurohypophysis, which stores and releases them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hormones such as adrenaline that cannot enter their target cells bind to membrane receptors and produce their effect through a second messenger such as:
सही उत्तर: क) cyclic AMP (cAMP)
Binding of adrenaline (or glucagon) to its membrane receptor activates adenylate cyclase, raising cAMP, which then triggers the cell's response.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Steroid hormones such as cortisol and testosterone act on their target cells mainly by:
सही उत्तर: घ) entering the cell and binding to intracellular (nuclear) receptors
Lipid-soluble steroid hormones cross the plasma membrane, bind intracellular receptors and the complex regulates gene expression.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Graves' disease (exophthalmic goitre), with protruding eyeballs, enlarged thyroid and raised metabolic rate, is a form of:
सही उत्तर: ग) hyperthyroidism
Graves' disease is an autoimmune hyperthyroidism with excess thyroid hormone, goitre and exophthalmos.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Parathyroid hormone (parathormone) mainly:
सही उत्तर: घ) increases the Ca²⁺ level in blood
PTH raises blood calcium by stimulating bone resorption, renal reabsorption of Ca²⁺ and intestinal absorption; calcitonin has the opposite effect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The vestibular apparatus of the inner ear helps in balance. Detection of rotational movements of the head is the function of the:
सही उत्तर: घ) crista ampullaris of the semicircular canals
The crista in the ampulla of each semicircular canal senses angular (dynamic) movement; the maculae of the utricle and saccule sense static position.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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