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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The first stable product of CO2 fixation in C3 plants is:
सही उत्तर: घ) 3-Phosphoglyceric acid
RuBisCO fixes CO2 with RuBP to give two molecules of 3-PGA, a 3-carbon compound.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kranz anatomy (bundle sheath cells with chloroplasts around vascular bundles) is characteristic of:
सही उत्तर: क) C4 plants
C4 plants like maize and sugarcane show Kranz anatomy, where the Calvin cycle occurs in bundle sheath cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Annual rings in a woody stem are formed due to the activity of:
सही उत्तर: ख) Vascular cambium
Differences in activity of vascular cambium in spring and autumn produce alternating early and late wood, seen as annual rings.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The thermostable DNA polymerase used in PCR (polymerase chain reaction) is obtained from:
सही उत्तर: घ) Thermus aquaticus
Taq polymerase from the thermophilic bacterium Thermus aquaticus withstands the high denaturation temperature of PCR.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a typical angiosperm embryo sac, how many cells and nuclei are present?
सही उत्तर: घ) 7 cells and 8 nuclei
The Polygonum type embryo sac has 3 antipodals, 2 synergids, 1 egg cell and 1 central cell with 2 polar nuclei.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In angiosperms, the endosperm is typically:
सही उत्तर: ख) Triploid (3n)
The endosperm forms from fusion of a male gamete with the diploid secondary nucleus (triple fusion), so it is 3n.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In bryophytes, the dominant, independent phase of the life cycle is the:
सही उत्तर: ख) Gametophyte
The main plant body of mosses and liverworts is the haploid gametophyte; the sporophyte depends on it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a heterosporous pteridophyte?
सही उत्तर: ग) Selaginella
Selaginella (and Salvinia) produce two kinds of spores, microspores and megaspores.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lichens are a symbiotic association between:
सही उत्तर: ख) An alga and a fungus
In lichens, the algal partner (phycobiont) photosynthesises and the fungal partner (mycobiont) provides shelter and water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The cell wall of fungi is mainly composed of:
सही उत्तर: घ) Chitin
Most fungal cell walls are made of chitin, a nitrogen-containing polysaccharide.
💬 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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