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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The primary function of the cilia found in the respiratory tract is: (a) Absorption of nutrients (b) Movement of mucus and trapped particles towards the throat (c) Gas exchange between air and blood (d) Structural support of the airway epithelium
सही उत्तर: ख) (b) Movement of mucus and trapped particles towards the throat
Cilia are tiny, hair-like structures that beat rhythmically to move mucus and debris up the respiratory tract. This is a key defense mechanism against infection. Option (a) refers to nutrient absorption; (c) describes gas exchange, and (d) concerns structural support - all of which are incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the function of erythrocytes (red blood cells)? (a) They primarily transport oxygen throughout the body. (b) They facilitate nerve impulse transmission. (c) They play a crucial role in immune responses against pathogens. (d) They are responsible for blood clotting and vasoconstriction.
सही उत्तर: क) (a) They primarily transport oxygen throughout the body.
Option (a) is correct because erythrocytes’ primary function is transporting oxygen bound to hemoglobin from the lungs to tissues throughout the body. Options (b), (c), and (d) represent functions of other cell types like neurons, lymphocytes, and platelets respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of the contractile ring during cell division in animal cells? (A) It facilitates chromosome segregation to opposite poles. (B) It synthesizes new DNA molecules required for replication. (C) It physically constricts the cell membrane during cytokinesis. (D) It provides energy for chromosome movement.
सही उत्तर: ख) (B) It synthesizes new DNA molecules required for replication.
The contractile ring is a belt of actin and myosin filaments that actively pinches the cell in two during cytokinesis (cell division), directly facilitating the separation of chromosomes into daughter cells. Options (B), (C), and (D) describe incorrect stages or mechanisms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of metamorphosis observed in amphibians like tadpoles transitioning into frogs relies on differential gene expression controlled primarily by: (A) Increased levels of adrenaline during the transition. (B) Hormonal regulation, particularly thyroid hormone, (C) Rapid changes in body temperature promoting cellular activity (D) Mutations in genes responsible for limb development.
सही उत्तर: ख) (B) Hormonal regulation, particularly thyroid hormone.
Metamorphosis in amphibians is fundamentally driven by hormonal control – specifically, increased levels of thyroid hormones – which orchestrate the dramatic morphological changes involved. Options (A), (C), and (D) represent incorrect mechanisms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of erythrocytes in maintaining homeostasis? (A) Erythrocytes regulate blood pressure through vasoconstriction. (B) Erythrocytes maintain a constant pH level in the bloodstream. (C) Erythrocytes transport oxygen and carbon dioxide, facilitating gas exchange. (D) Erythrocytes produce hormones that control metabolism.
सही उत्तर: ग) (C) Erythrocytes transport oxygen and carbon dioxide, facilitating gas exchange.
Erythrocytes (red blood cells) are primarily responsible for transporting oxygen and carbon dioxide throughout the body, which is central to gas exchange and thus directly supports maintaining physiological homeostasis. Options (A), (B), and (D) relate to other cell types or functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of goblet cells found throughout the human respiratory tract is to: (A) Transport oxygen to the alveoli (B) Secrete mucus to trap pathogens and debris (C) Stimulate cilia movement for removing trapped particles (D) Regulate airflow into and out of the lungs
सही उत्तर: ख) (B) Secrete mucus to trap pathogens and debris
Goblet cells produce mucus, which acts as a sticky layer trapping inhaled particles like dust, bacteria, and viruses. This is the main function; options (A), (C), and (D) describe other related but incorrect mechanisms within the respiratory system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of a swim bladder in fish primarily contributes to which of the following?
सही उत्तर: ख) B) Precise buoyancy control aiding movement.
Option B is correct; a swim bladder allows fish to regulate their depth in the water column by controlling their buoyancy, which significantly impacts their movement and survival. Options A, C, and D describe functions of other biological systems.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The lateral line system in fish detects changes in which of the following?
सही उत्तर: ख) B) Water pressure – allowing them to navigate.
Option B accurately describes the function of the lateral line system; it detects vibrations and pressure changes in the surrounding water, providing information about movement and obstacles. Options A, C, and D are incorrect as they relate to other sensory systems.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of the contractile ring formed during cell division?
सही उत्तर: ख) B) It allows for accurate segregation of duplicated chromosomes into daughter cells.
Option B correctly identifies the purpose of the contractile ring: to physically divide the cytoplasm and ensure that each new cell receives a complete set of chromosomes. Options A and C relate to other cellular structures, while option D is related to DNA replication.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘negative feedback’ primarily functions to maintain homeostasis within an organism. Which of the following best describes this mechanism?
सही उत्तर: ख) B) Counteracting deviations from a set point to stabilize conditions.
Option B is correct as negative feedback loops work by opposing or reversing the initial stimulus, bringing the system back towards its equilibrium. Option A describes positive feedback, which amplifies changes. Option C refers to sensitization, and option D concerns adaptation via mutation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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