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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Microtubules of the cytoskeleton are made of the protein:
सही उत्तर: ग) Tubulin
Microtubules are hollow cylinders built from alpha- and beta-tubulin dimers; actin forms microfilaments.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In angiosperms, which living cell of the phloem lacks a nucleus at maturity?
सही उत्तर: क) Sieve tube element
Mature sieve tube elements lose their nucleus; their functions are controlled by the nucleus of the adjacent companion cell.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Glyoxysomes, which convert stored fats into carbohydrates, are found in:
सही उत्तर: क) Germinating oil-rich seeds
Glyoxysomes contain glyoxylate cycle enzymes that convert fatty acids to sugars in germinating fatty seeds such as castor and groundnut.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Detoxification of drugs and poisons in liver cells is mainly carried out by the:
सही उत्तर: ख) Smooth endoplasmic reticulum
The smooth ER of hepatocytes contains enzymes (such as cytochrome P450) that detoxify drugs and poisons; it lacks ribosomes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Biological magnification (biomagnification) of DDT means that its concentration:
सही उत्तर: क) Increases at successive trophic levels
Non-biodegradable DDT accumulates in tissues and its concentration rises at each higher trophic level.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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HIV primarily attacks which cells of the immune system?
सही उत्तर: ख) Helper T cells (CD4+)
HIV binds CD4 receptors on helper T lymphocytes and destroys them, weakening immunity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which class of antibody can cross the placenta?
सही उत्तर: क) IgG
IgG is the only immunoglobulin that crosses the placenta, giving passive immunity to the foetus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Antibodies are produced by:
सही उत्तर: ख) Plasma cells (B lymphocytes)
Activated B lymphocytes differentiate into plasma cells which secrete antibodies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the human female, the corpus luteum mainly secretes:
सही उत्तर: क) Progesterone
The corpus luteum secretes large amounts of progesterone, which maintains the endometrium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The part of the brain that maintains body balance and coordinates voluntary movements is the:
सही उत्तर: ख) Cerebellum
The cerebellum coordinates muscular activity and maintains posture and equilibrium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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