कृषि, पशु र वन विज्ञान B.Sc. Forestry प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Forestry प्रवेश
B.Sc. Forestry Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान 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 Mesozoic era of the geological time scale is known as the:
सही उत्तर: घ) Age of reptiles
Dinosaurs and other reptiles dominated the Mesozoic era (Triassic, Jurassic and Cretaceous periods).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Proteinoid 'microspheres', proposed as possible precursors of the first cells, were produced experimentally by:
सही उत्तर: घ) Sidney Fox
Sidney Fox heated amino acids to form proteinoids, which in water formed cell-like microspheres; Oparin proposed coacervates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The close resemblance between the placental wolf and the Tasmanian wolf (a marsupial), which are not closely related, is an example of:
सही उत्तर: क) Convergent evolution
Unrelated organisms living in similar habitats evolve similar forms; this is convergent evolution producing analogous resemblance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The recapitulation theory ('ontogeny recapitulates phylogeny'), also called the biogenetic law, was proposed by:
सही उत्तर: ग) Ernst Haeckel
Ernst Haeckel stated that the development of an individual repeats the evolutionary history of its group.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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That X-rays can induce mutations was first demonstrated in Drosophila by:
सही उत्तर: क) H. J. Muller
Hermann J. Muller showed in 1927 that X-rays greatly increase the mutation rate in Drosophila, earning a Nobel Prize.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first genetic (linkage) map of a chromosome was prepared in 1913 by:
सही उत्तर: घ) Alfred Sturtevant
Sturtevant, a student of Morgan, used recombination frequencies between X-linked genes of Drosophila to construct the first map.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Crossing over normally does not occur, so linkage is complete, in:
सही उत्तर: क) Male Drosophila
In Drosophila, crossing over is absent in males, so linked genes in males are inherited together (complete linkage).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Common bread wheat (Triticum aestivum) with 42 chromosomes is a:
सही उत्तर: क) Hexaploid
Bread wheat is an allohexaploid (6n = 42, with x = 7) formed by combining three different diploid genomes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An individual with the chromosome number 2n − 1 is described as:
सही उत्तर: ग) Monosomic
Loss of one chromosome from a diploid set (2n − 1) is monosomy; 2n − 2 is nullisomy and 2n + 1 is trisomy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The failure of homologous chromosomes or sister chromatids to separate properly during cell division is called:
सही उत्तर: ख) Non-disjunction
Non-disjunction produces gametes with an extra or missing chromosome, leading to aneuploidy such as trisomy.
💬 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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