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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A diploid cell with 2n = 16 chromosomes undergoes mitosis. How many chromatids are present at metaphase?
सही उत्तर: क) 32
After S phase each of the 16 chromosomes has two sister chromatids, so metaphase shows 16 x 2 = 32 chromatids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cells that exit the cell cycle and stop dividing, such as mature nerve cells, are said to be in the:
सही उत्तर: ख) G0 (quiescent) phase
Cells that do not divide further leave G1 and enter an inactive G0 or quiescent stage while remaining metabolically active.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In plant cells, cytokinesis takes place mainly by:
सही उत्तर: ग) Cell plate formation
Plant cells have a rigid wall, so a cell plate forms in the centre and grows outward to divide the cytoplasm; animal cells use a furrow.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Terminalisation of chiasmata is completed during which sub-stage of prophase I?
सही उत्तर: ग) Diakinesis
Diakinesis, the last stage of prophase I, is marked by terminalisation of chiasmata, disappearance of the nucleolus and breakdown of the nuclear envelope.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During which phase of mitosis do the chromosomes line up at the equatorial plate?
सही उत्तर: घ) Metaphase
At metaphase the chromosomes, attached to spindle fibres at their kinetochores, align on the metaphase (equatorial) plate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A chromosome whose centromere is slightly away from the middle, giving one shorter and one longer arm, is called:
सही उत्तर: घ) Submetacentric
In a submetacentric chromosome the centromere is near the middle, so the two arms are slightly unequal (L-shaped at anaphase).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Golden rice has been genetically engineered to be rich in:
सही उत्तर: क) Beta-carotene (provitamin A)
Golden rice carries genes for beta-carotene synthesis in the grain, giving it a golden colour and helping fight vitamin A deficiency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term 'cell' was first used in 1665 by:
सही उत्तर: क) Robert Hooke
Robert Hooke observed dead cork cells under his microscope and called the small compartments 'cells' in his book Micrographia (1665).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following organelles is bounded by a single membrane?
सही उत्तर: क) Lysosome
Lysosomes are bounded by a single unit membrane, whereas mitochondria, chloroplasts and the nucleus have a double membrane envelope.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The '9 + 2' arrangement of microtubules is found in the axoneme of:
सही उत्तर: घ) Eukaryotic cilia and flagella
Eukaryotic cilia and flagella have nine peripheral doublets and two central singlet microtubules; centrioles and basal bodies show a 9 + 0 triplet pattern.
💬 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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