जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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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Along with Charles Darwin, the theory of evolution by natural selection was independently formulated by:
सही उत्तर: क) Alfred Russel Wallace
Wallace arrived at the same idea independently, and their joint paper was presented in 1858.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phrase 'survival of the fittest' was coined by:
सही उत्तर: घ) Herbert Spencer
Herbert Spencer coined the phrase; Darwin later used it in later editions of 'On the Origin of Species'.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Thalassaemia differs from sickle cell anaemia in that it is:
सही उत्तर: ग) A quantitative defect caused by reduced synthesis of globin chains
Thalassaemia is a quantitative problem (too few globin chains made), while sickle cell anaemia is a qualitative problem (abnormal globin).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cri-du-chat syndrome results from a deletion in the short arm of chromosome:
सही उत्तर: ख) 5
Partial deletion of the short arm (5p) of chromosome 5 causes cri-du-chat ('cry of the cat') syndrome.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Edwards' syndrome is caused by trisomy of chromosome number:
सही उत्तर: ख) 18
Edwards' syndrome is trisomy 18; Down's is trisomy 21 and Patau's is trisomy 13.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In honeybees, male drones develop from unfertilised eggs. This method of sex determination is called:
सही उत्तर: ख) Haplodiploidy
In haplodiploid insects, fertilised (diploid) eggs become females and unfertilised (haploid) eggs become males.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following human disorders is inherited as an autosomal dominant trait?
सही उत्तर: घ) Huntington's disease
Huntington's disease is autosomal dominant; haemophilia is X-linked recessive and the other two are autosomal recessive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a single gene influences several different phenotypic traits, the phenomenon is called:
सही उत्तर: ग) Pleiotropy
In pleiotropy one gene has multiple effects, e.g. the PKU gene affects mental development and pigmentation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dihybrid test cross (AaBb x aabb) with independent assortment gives the phenotypic ratio:
सही उत्तर: क) 1 : 1 : 1 : 1
AaBb forms four gametes in equal proportion, and aabb contributes only ab, so four phenotypes appear equally.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mendel's work was rediscovered in 1900 independently by:
सही उत्तर: क) de Vries, Correns and Tschermak
Hugo de Vries, Carl Correns and Erich von Tschermak independently rediscovered Mendel's laws in 1900.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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