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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Net primary productivity (NPP) of an ecosystem is equal to:
सही उत्तर: क) gross primary productivity minus respiration losses of producers
NPP = GPP − R; it is the biomass available to heterotrophs (herbivores and decomposers).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a plant of genotype AaBbCc (three independently assorting genes) is self-pollinated, the proportion of offspring with genotype aabbcc is:
सही उत्तर: घ) 1/64
The probability of aa, bb and cc is 1/4 each, so P(aabbcc) = 1/4 × 1/4 × 1/4 = 1/64.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the F₂ generation of a trihybrid cross (AaBbCc × AaBbCc) with independent assortment and complete dominance, the number of different genotypes is:
सही उत्तर: ग) 27
Each gene gives 3 genotypes, so 3³ = 27 genotypes; there are 2³ = 8 phenotypes and 4³ = 64 gamete combinations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Mendel's monohybrid cross (Tt × Tt), the genotypic ratio in the F₂ generation is:
सही उत्तर: क) 1 : 2 : 1
The F₂ contains TT, Tt and tt in the ratio 1 : 2 : 1, while the phenotypic ratio (tall : dwarf) is 3 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In artificial hybridisation of a bisexual flower, the removal of anthers from the flower bud before they dehisce is called:
सही उत्तर: क) emasculation
Emasculation prevents self-pollination; the flower is then bagged to keep out unwanted pollen until the desired pollen is dusted on.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The weed whose pollen causes allergies and respiratory problems in many people, and which came to South Asia as a contaminant of imported wheat, is:
सही उत्तर: ख) Parthenium (carrot grass)
Parthenium hysterophorus (carrot grass) produces abundant allergenic pollen; it is believed to have arrived with imported wheat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The occurrence of more than one embryo in a seed, common in Citrus and mango, is called:
सही उत्तर: क) polyembryony
In Citrus and mango some nucellar cells develop into extra embryos, so one seed contains several embryos.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Maize is pollinated mainly by wind. The large, feathery stigmas of its 'silk' help to:
सही उत्तर: ग) trap pollen grains carried by the air
Wind-pollinated flowers produce light, non-sticky pollen in large amounts and have large feathery stigmas to catch airborne pollen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flowers that never open, so that only self-pollination is possible, are called cleistogamous. They are found in:
सही उत्तर: घ) Commelina, Viola and Oxalis
Cleistogamous flowers of Viola, Oxalis and Commelina remain closed; their anthers and stigma lie close, ensuring autogamy and assured seed set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In most flowering plants the embryo sac develops from a single functional megaspore. This type of development is called:
सही उत्तर: ग) monosporic (Polygonum type)
Of the four megaspores formed by meiosis, three degenerate and only one develops into the 7-celled, 8-nucleate embryo sac.
💬 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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