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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Gram-positive bacteria retain the crystal violet stain because their cell wall has:
सही उत्तर: ग) A thick peptidoglycan layer
The thick peptidoglycan layer traps the crystal violet-iodine complex during decolourisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The smallest known free-living prokaryotes, which lack a cell wall, are:
सही उत्तर: ग) Mycoplasma
Mycoplasma (PPLO) lack a cell wall and are among the smallest known living cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Viroids, discovered by T.O. Diener, differ from viruses in that they:
सही उत्तर: ग) Lack a protein coat and consist of free RNA
Viroids are small, circular, naked RNA molecules without a protein capsid (e.g. potato spindle tuber viroid).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Viruses that infect bacteria are called:
सही उत्तर: क) Bacteriophages
Bacteriophages (e.g. T4) are viruses that infect and replicate within bacteria.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which is the correct sequence of taxonomic categories in descending order?
सही उत्तर: ग) Kingdom, Phylum, Class, Order, Family, Genus, Species
The hierarchy runs Kingdom > Phylum/Division > Class > Order > Family > Genus > Species.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bt cotton is resistant to bollworm because it carries a gene for a toxic protein from:
सही उत्तर: ग) Bacillus thuringiensis
The cry genes of Bacillus thuringiensis code for Cry proteins that are toxic to insect larvae.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The five-kingdom classification was proposed by:
सही उत्तर: क) R.H. Whittaker
Whittaker (1969) classified organisms into Monera, Protista, Fungi, Plantae and Animalia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a vestigial organ in humans?
सही उत्तर: क) Vermiform appendix
The vermiform appendix is a reduced, largely non-functional remnant of a larger caecum in ancestors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Industrial melanism in the peppered moth (Biston betularia) is a classic example of:
सही उत्तर: क) Natural selection
Dark moths were better camouflaged on soot-covered trees and were selected by bird predation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Stanley Miller's experiment simulating primitive earth conditions produced:
सही उत्तर: ख) Amino acids
Electric sparks in a mixture of CH4, NH3, H2 and water vapour produced simple organic compounds such as amino acids.
💬 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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