जीव विज्ञान – Zoology – Zoology MCQ
जीव विज्ञान – Zoology – CEE प्रवेश
Zoology · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०८ प्रश्न
४०८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान – Zoology: 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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Which of the following correctly describes the role of microvilli in intestinal epithelial cells?
सही उत्तर: ख) B. To increase surface area for nutrient absorption.
Microvilli are small, finger-like projections that significantly increase the surface area of intestinal epithelial cells, maximizing their capacity to absorb nutrients from digested food. This is a key adaptation for efficient nutrient uptake – Options A and D describe other functions; C relates to cell division.”} 0, {
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of spermatogenesis (sperm production) occurs in which specific region of the male reproductive system?
सही उत्तर: ख) B. Seminiferous Tubules.
Spermatogenesis, the process of sperm cell development, takes place within the seminiferous tubules located inside the testes. These tubules are specifically designed for this function – Option A is a location where mature sperm reside; C is a duct transporting sperm and D is an accessory gland.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of the contractile vacuoles found in freshwater protozoa?
सही उत्तर: ख) B. To regulate osmotic pressure by expelling excess water collected from the environment.
Contractile vacuoles are specialized organelles found in freshwater protozoa that actively pump out excess water that has entered the cells via osmosis. This prevents the cell from swelling and bursting due to the surrounding hypotonic environment – Option A and D describe functions of other structures, while C describes protein synthesis.”} , 1, {
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ‘syncytial’ nature of amoeba cells contributes to their feeding behavior. What does this term refer to?
सही उत्तर: ख) B. The fusion of cytoplasm fragments to form a single, large continuous cytoplasmic mass.
A ‘syncytium’ is a multinucleate cell formed by the fusion of multiple cells or cytoplasm fragments. This creates a large, continuous cytoplasmic mass that allows for efficient movement and engulfment of food particles in amoeba – the key characteristic of their feeding process. Options A describes multi-nucleated cells but isn't the defining feature; C describes enzyme secretion, and D describes a different cellular structure.”} , 1, {
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of xylem tissue in plants is:
सही उत्तर: ख) Conducting water and minerals from roots to shoots
Xylem vessels are specialized for conducting water and dissolved mineral salts upwards from the roots to the rest of the plant. Transport of sugars occurs via phloem; starch storage happens in parenchyma cells, and providing structural support is a function of collenchyma and sclerenchyma.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following accurately describes the function of the ‘syncytium’ observed in Plasmodium (the malarial parasite)?
सही उत्तर: ग) A multinucleated cell formed by multiple nuclear divisions
A syncytium is a large cell containing multiple nuclei resulting from repeated nuclear division. This allows Plasmodium to move rapidly through the host's bloodstream and tissues. A cell wall would be absent; it’s not an independent organism; and DNA replication occurs in individual cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of metamorphosis in amphibians, such as frogs, involves a dramatic change in body form. Which developmental stage directly precedes the tadpole's transition to a frog?
सही उत्तर: ख) Nymph Stage
The nymph stage is a transitional phase where the tadpole develops limbs, loses its tail, and undergoes other changes necessary for metamorphosis into a frog. The larval mouth (initial stage) precedes this transition; metamorphosis is the overall process, and egg hatching represents the initial beginning.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the role of cilia in human respiratory epithelium?
सही उत्तर: ग) Move mucus and trapped debris towards the pharynx
Cilia are tiny hair-like structures that beat rhythmically to propel mucus containing trapped particles away from the lower respiratory tract. Secreting mucus is a function of goblet cells; structural support is provided by collagen fibers; and regulating airflow is primarily controlled by muscles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of facilitated diffusion, where a membrane protein assists the movement of molecules down their concentration gradient, is primarily used for transporting which of the following substances across cell membranes?
सही उत्तर: क) Simple Diffusion
Facilitated diffusion utilizes carrier proteins to speed up the movement of solutes like glucose and amino acids down their concentration gradients. Simple diffusion involves passive movement without protein assistance; osmosis is the movement of water; active transport requires energy expenditure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the primary function of the goblet cells found in the human trachea?
सही उत्तर: ख) To filter and moisten inhaled air, trapping particulate matter
Goblet cells secrete mucus, which traps dust, bacteria, and other foreign particles in the trachea. This is a crucial defense mechanism, while the other options describe different cell functions within the respiratory system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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