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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Lampbrush chromosomes are typically observed in:
सही उत्तर: क) Oocytes of amphibians
Lampbrush chromosomes are large, loop-bearing chromosomes seen in the diplotene oocytes of amphibians and other vertebrates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nucleus of the cell was discovered in 1831 by:
सही उत्तर: घ) Robert Brown
Robert Brown observed and named the nucleus in orchid cells in 1831.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Centrioles are generally absent in the cells of:
सही उत्तर: ग) Higher (flowering) plants
Cells of angiosperms lack centrioles; the spindle forms without them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Microfilaments of the cytoskeleton are composed mainly of the protein:
सही उत्तर: क) Actin
Microfilaments are thin polymers of actin, whereas microtubules are made of tubulin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cytoplasmic strands that pass through plant cell walls and connect neighbouring cells are called:
सही उत्तर: क) Plasmodesmata
Plasmodesmata are channels through the cell walls that link the cytoplasm of adjacent plant cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme catalase, which breaks down hydrogen peroxide into water and oxygen, is mainly found in:
सही उत्तर: ख) Peroxisomes
Peroxisomes contain oxidases that produce H2O2 and catalase that decomposes it into water and oxygen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excessive growth of algae in a lake due to run-off of nitrates and phosphates from fertilised fields is called:
सही उत्तर: ख) Eutrophication
Nutrient enrichment causes algal blooms, oxygen depletion and death of fish; this is eutrophication.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pioneer organisms that first colonise bare rock in a xerarch succession are usually:
सही उत्तर: क) Lichens
Crustose lichens secrete acids that weather rock and form the first soil, paving the way for mosses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Potato, tomato and brinjal belong to the family:
सही उत्तर: घ) Solanaceae
Potato (Solanum tuberosum), tomato and brinjal (Solanum melongena) are members of Solanaceae.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Special breathing roots (pneumatophores) that grow vertically upwards out of the mud are found in:
सही उत्तर: ग) Mangroves such as Rhizophora
Mangrove plants in waterlogged saline soil have negatively geotropic pneumatophores to obtain oxygen.
💬 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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