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
२,४५८ 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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Pollination by wind is called:
सही उत्तर: ख) Anemophily
Wind-pollinated flowers such as maize and grasses produce light, abundant pollen. Entomophily is pollination by insects.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The endosperm of angiosperms is:
सही उत्तर: क) Triploid (3n)
Endosperm forms when one male gamete fuses with the diploid secondary nucleus (triple fusion), giving 3n tissue. The zygote formed by syngamy is diploid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which material is commonly used in the laboratory to study stages of mitosis?
सही उत्तर: घ) Onion root tip
Onion root tips have actively dividing meristematic cells, ideal for observing mitosis. Pollen mother cells (anthers) are used to study meiosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Meiosis (both meiotic divisions together) in one diploid cell produces:
सही उत्तर: घ) Four haploid cells
Meiosis has two successive divisions and one DNA replication, giving four haploid cells. Mitosis gives two diploid cells identical to the parent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Crossing over between homologous chromosomes occurs during:
सही उत्तर: क) Pachytene of prophase I
Crossing over occurs at pachytene, when bivalents are fully synapsed. Synapsis begins earlier in zygotene, and chiasmata become visible in diplotene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which structure is typically absent in the cells of higher plants?
सही उत्तर: ग) Centriole
Higher plant cells form spindles without centrioles. Cell walls, plastids and large vacuoles are characteristic of plant cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which organelle is called the 'suicide bag' of the cell?
सही उत्तर: ख) Lysosome
Lysosomes contain hydrolytic enzymes, and their rupture can digest the cell itself (autolysis). Peroxisomes contain enzymes like catalase that break down hydrogen peroxide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fluid mosaic model of the plasma membrane was proposed by:
सही उत्तर: ख) Singer and Nicolson
Singer and Nicolson (1972) described the membrane as a fluid lipid bilayer with proteins floating in it. Danielli and Davson proposed the earlier sandwich model.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The cell wall of most fungi is made mainly of:
सही उत्तर: ख) Chitin
Fungal cell walls are made of chitin, a nitrogen-containing polysaccharide also found in insect exoskeletons. Peptidoglycan forms bacterial cell walls.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Proteins are synthesised in the cell on:
सही उत्तर: क) Ribosomes
Ribosomes translate mRNA into polypeptides. Golgi bodies modify and package proteins but do not synthesise them.
💬 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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