कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४२५ प्रश्न
२,४२५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन 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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In poultry, which sex is heterogametic?
सही उत्तर: क) Female (ZW)
Birds follow the ZW system: hens are ZW and cocks are ZZ, so the hen determines the sex of the chick. In humans, by contrast, the male is heterogametic (XY).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person with blood group AB expresses both A and B antigens. This is an example of:
सही उत्तर: क) Codominance
In codominance both alleles (IA and IB) are fully expressed in the heterozygote. In incomplete dominance the heterozygote is intermediate instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Mirabilis jalapa (four o'clock plant), the F2 phenotypic ratio for flower colour is:
सही उत्तर: ख) 1:2:1
Flower colour in Mirabilis shows incomplete dominance, so red, pink and white appear in 1:2:1, the same as the genotypic ratio. A 3:1 ratio appears only with complete dominance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A test cross is a cross between an F1 individual and:
सही उत्तर: क) The homozygous recessive parent
Crossing with the homozygous recessive reveals whether the dominant-looking individual is homozygous or heterozygous. A cross with any parent is called a back cross.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Mendel's dihybrid cross, the phenotypic ratio of the F2 generation is:
सही उत्तर: ग) 9:3:3:1
Crossing two dihybrids (RrYy x RrYy) gives four phenotypes in a 9:3:3:1 ratio. The 1:1:1:1 ratio results from a dihybrid test cross.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Khaira disease of rice is caused by deficiency of:
सही उत्तर: घ) Zinc
Khaira disease, with brown patches on rice leaves, results from zinc deficiency and is corrected by applying zinc sulphate. Boron deficiency causes problems like hollow stem and poor fruit set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The central metal atom in a chlorophyll molecule is:
सही उत्तर: ख) Magnesium
Chlorophyll has a porphyrin ring with magnesium at its centre, so Mg deficiency causes chlorosis. Iron is the central atom of haem in haemoglobin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mycorrhiza is a symbiotic association between:
सही उत्तर: क) A fungus and roots of a higher plant
In mycorrhiza fungal hyphae help roots absorb phosphorus and water while getting food from the plant. An alga-fungus association is a lichen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The actinomycete Frankia forms nitrogen-fixing root nodules in:
सही उत्तर: ग) Alnus
Frankia nodulates non-leguminous plants such as Alnus (alder) and Casuarina. Pea, gram and soybean are legumes nodulated by rhizobia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Azolla is used as a biofertilizer in rice fields because it harbours the nitrogen-fixing cyanobacterium:
सही उत्तर: ख) Anabaena
The water fern Azolla carries Anabaena azollae in its leaf cavities, which fixes nitrogen. Glomus is a mycorrhizal fungus that helps phosphorus uptake.
💬 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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