चिकित्सा शिक्षा आयोग (CEE) एमबीबीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – एमबीबीएस प्रवेश परीक्षा
CEE – MBBS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing 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 outer layer (exine) of the pollen grain is made of:
सही उत्तर: ग) Sporopollenin
Sporopollenin is extremely resistant to high temperature, acids and enzymes, which is why pollen fossils are preserved. The inner intine is made of cellulose and pectin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The photoreceptor pigment involved in photoperiodism, existing in red and far-red absorbing forms, is:
सही उत्तर: घ) Phytochrome
Phytochrome exists as Pr and Pfr forms that interconvert with red and far-red light. Cytochromes are electron carriers in respiration, not photoreceptors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Promotion of flowering by exposure to low temperature is called:
सही उत्तर: घ) Vernalisation
Vernalisation is the low-temperature treatment that induces or hastens flowering, as in winter wheat. Photoperiodism is the response to day length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'foolish seedling' (bakanae) disease of rice led to the discovery of:
सही उत्तर: घ) Gibberellins
Kurosawa found that the fungus Gibberella fujikuroi caused excessive elongation of rice seedlings, leading to the discovery of gibberellins. Cytokinins were discovered as kinetin from autoclaved herring sperm DNA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which plant hormone is a gas and promotes ripening of fruits?
सही उत्तर: क) Ethylene
Ethylene is a gaseous hormone that hastens fruit ripening and is used for ripening bananas commercially. The other three are non-gaseous hormones.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'stress hormone' that causes stomatal closure is:
सही उत्तर: ग) Abscisic acid
Abscisic acid (ABA) increases under water stress and closes stomata; it also induces seed dormancy. Gibberellins break dormancy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The plant hormone that delays leaf senescence (Richmond–Lang effect) is:
सही उत्तर: घ) Cytokinin
Cytokinins delay senescence by promoting nutrient mobilisation. Ethylene and abscisic acid promote senescence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Apical dominance in plants is caused by:
सही उत्तर: ख) Auxin
Auxin produced by the shoot apex suppresses the growth of lateral buds. Cytokinins tend to overcome apical dominance and promote lateral bud growth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In yeast, anaerobic respiration (alcoholic fermentation) produces:
सही उत्तर: ग) Ethanol and CO2
Yeast converts pyruvate to ethanol and CO2 under anaerobic conditions. Lactic acid is produced by some bacteria and by muscle cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The respiratory quotient (RQ) when fats such as tripalmitin are used as respiratory substrate is about:
सही उत्तर: ग) 0.7
Tripalmitin uses 145 O2 and releases 102 CO2, giving RQ = 102/145 ≈ 0.7. Carbohydrates give an RQ of 1.
💬 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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