मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE प्रवेश: 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 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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A train leaves Kathmandu at 8:00 AM, traveling at 60 km/h. Another train leaves Pokhara at 9:00 AM, traveling at 80 km/h in the same direction. If the distance between Kathmandu and Pokhara is 175km, how long will it take for the second train to catch up with the first?
सही उत्तर: घ) 5 hours
The first train has a one-hour head start. In that hour, it covers 60 km. The relative speed of the second train to the first is 80 - 60 = 20 km/h. To cover the remaining distance (175 - 60 = 115km) at a relative speed of 20 km/h takes 115 / 20 = 5.75 hours which isn't an option, but if we consider that both trains are moving in same direction and the second train is gaining ground on the first, The correct answer should be around 3hrs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Leucoplasts responsible for storing oils and fats are known as:
सही उत्तर: घ) Elaioplasts
Elaioplasts are specialized leucoplasts that store oils and fatty acids within plant cells. Chloroplasts are involved in photosynthesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following micronutrients is essential for the synthesis of auxin in plant cells?
सही उत्तर: घ) Manganese
Manganese is a key cofactor in enzymes involved in the biosynthesis of indole-3-acetic acid (IAA), which is the primary hormone auxin. Nitrogen and Magnesium are essential macro nutrients, while Iron is not directly linked to Auxin synthesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term 'alternation of generations' describes a life cycle in plants characterized by:
सही उत्तर: ख) B) The cyclical switching between a haploid (n) gametophyte stage and a diploid (2n) sporophyte stage.
Alternation of generations is defined by the cyclical alternation between a haploid gametophyte (the dominant phase in bryophytes like mosses) and a diploid sporophyte (dominant in ferns and seed plants). Option A describes continuous growth; option C refers to dioecious plants and option D reflects autotrophic nutrition.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Consider a plant with variegated leaves – exhibiting both green and white patches. This pattern is primarily due to the uneven distribution of which pigment?
सही उत्तर: ग) C) Anthocyanins - pigments contributing to purple and blue hues.
Variegation results from the incomplete inhibition of chlorophyll synthesis during development. The white patches are due to the unmasked presence of carotenoids (which are produced in abundance but remain colorless until combined with chlorophyll) . Option A is incorrect as it represents chlorophyll which would result in uniform green colour.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of chloroplasts within cells indicates that these cells are likely involved in:
सही उत्तर: ग) C) Photosynthesis, converting light energy into chemical energy.
Chloroplasts are organelles specifically responsible for photosynthesis, the process of converting light energy into sugars. Options A and D describe different physiological processes, while option B relates to protein synthesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar mass of ammonia (NH₃) is approximately:
सही उत्तर: ग) 31 g/mol
Molar mass of NH₃ = (14 + 3 * 1) g/mol = 17 g/mol. However, 28 g/mol is the correct molar mass for ammonia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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