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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The phenomenon of ‘poikilothermy’ is most closely associated with which characteristic of ectothermic animals? (a) Maintaining a constant internal body temperature regardless of the external environment. (b) Dependence on external sources for thermoregulation, such as basking in sunlight or seeking shade. (c) Having a highly developed nervous system capable of coordinating complex behavioral responses to temperature changes. (d) Exhibiting rapid metabolic rates dependent on environmental temperature fluctuations.
सही उत्तर: ख) (b) Dependence on external sources for thermoregulation, such as basking in sunlight or seeking shade.
Option (b) is correct. Poikilothermy refers to the ability of ectothermic animals to maintain a variable body temperature, relying heavily on their environment for warmth. Options (a), (c) and (d) misrepresent fundamental aspects of endothermic vs. ectothermic physiology.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the process of metamorphosis observed in amphibians like frogs? (a) A gradual transformation with continuous growth and development of adult features throughout life. (b) A sudden, complete replacement of larval structures by adult structures in a single event. (c) A series of discrete developmental stages characterized by distinct morphological changes and physiological adaptations that occur over time. (d) Primarily asexual reproduction followed by genetic recombination during the transition period.
सही उत्तर: ग) (c) A series of discrete developmental stages characterized by distinct morphological changes and physiological adaptations that occur over time.
Option (c) is correct because amphibian metamorphosis, such as that seen in frogs, involves a sequential process of transformation—the gradual loss of larval features like gills and tail, alongside the development of adult limbs and lungs. Options (a), (b) and (d) are incorrect as they describe different types of developmental processes or reproductive strategies that do not accurately represent amphibian metamorphosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The typhlosole, a median fold in the intestine of the earthworm, serves to: (A) Increase surface area for nutrient absorption. (B) Provide skeletal support to the gut wall. (C) Facilitate peristaltic movements. (D) Absorb water and electrolytes.
सही उत्तर: ख) (B) Provide skeletal support to the gut wall.
The typhlosole is a median fold in the intestine of earthworms that significantly increases the surface area for nutrient absorption. This aids digestion by providing more space for enzymes to act upon food. The other options are incorrect as they relate to different functions or structures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which ion is essential for blood coagulation? (A) Sodium ions (Na+) (B) Calcium ions (Ca2+) (C) Potassium ions (K+) (D) Magnesium ions (Mg2+)
सही उत्तर: ख) (B) Calcium ions (Ca2+)
Calcium ions (Ca2+) are crucial for the activation of clotting factors in the blood coagulation cascade. While other ions play roles in physiological processes, calcium is fundamentally involved in forming a stable fibrin clot – making it the correct answer. Sodium, potassium and magnesium do not directly participate in this process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of fertilization in mammals involves the fusion of a sperm cell with an egg cell. Which hormone plays a crucial role in preparing the uterine lining for implantation of the developing embryo? (A) Insulin (B) Estrogen (C) Progesterone (D) Testosterone
सही उत्तर: ग) (C) Progesterone
Progesterone is essential for maintaining the uterine lining during pregnancy and preparing it to receive and nourish a fertilized egg. Estrogen also plays a role but is less directly involved in implantation preparation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a key characteristic of cartilaginous fishes? (A) They possess a swim bladder for buoyancy control. (B) They have a bony skeleton with rigid joints. (C) They exhibit skeletal gills supported by cartilage. (D) They lack a true vertebral column.
सही उत्तर: ग) (C) They exhibit skeletal gills supported by cartilage.
Cartilaginous fishes, like sharks and rays, are defined by their skeletons which include cartilaginous supports for the gills. A swim bladder is found in bony fish, (B) describes a bony structure, and (D) is incorrect as they have a vertebral column.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is responsible for the maintenance of body temperature in mammals? (A) Epidermis (B) Hypothalamus (C) Skeletal muscle (D) Liver
सही उत्तर: ख) (B) Hypothalamus
The hypothalamus in the brain acts as a thermostat, regulating body temperature by initiating responses like shivering or sweating. Option (C) is incorrect because muscles generate heat, and option (D) is not directly involved in temperature regulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of osmosis involves the movement of water across a semi-permeable membrane. Which of the following best explains why red blood cells (RBCs) swell when placed in distilled water? (A) Water moves into RBCs because the concentration of solutes inside is lower than outside. (B) Water moves into RBCs because the concentration of solutes inside is higher than outside. (C) Solutes move out of RBCs due to active transport, creating a pressure gradient. (D) The membrane of RBCs becomes permeable to water under osmotic pressure.
सही उत्तर: क) (A) Water moves into RBCs because the concentration of solutes inside is lower than outside.
Osmosis occurs when there's a difference in water concentration across a semi-permeable membrane. Because the distilled water has essentially no solutes, water moves into the RBCs down this concentration gradient. (B) is incorrect because it describes a situation where water would move *out*.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the function of cilia in respiratory epithelium? (A) They facilitate gas exchange between air and blood. (B) They trap particulate matter and pathogens from inhaled air. (C) They contract to propel mucus towards the pharynx for swallowing. (D) They increase the surface area available for absorption of nutrients.
सही उत्तर: ख) (B) They trap particulate matter and pathogens from inhaled air.
Cilia are hair-like structures that beat in a coordinated manner, moving mucus and trapped particles upwards out of the lungs. This prevents irritation and infection. Option (A) describes gas exchange, (C) is correct, and (D) relates to absorption which isn't the primary function of cilia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Limulus polyphemus (the ‘living fossil’) is a highly significant species in marine biology. To which phylum does it primarily belong?
सही उत्तर: क) Mollusca
Limulus is a member of the Phylum Arthropoda, more specifically within the subphylum Chelicerata, and is classified as a 'living fossil' due to its ancient lineage resembling early arthropods – particularly horseshoe crabs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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