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 ‘fight or flight’ response in mammals is primarily mediated by which component of the autonomic nervous system?
सही उत्तर: ग) c) The sympathetic branch
Option (c) – the sympathetic branch – controls the ‘fight or flight’ response, triggering adrenaline release and physiological changes preparing the body for action. The other options are associated with different autonomic functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following cell junctions contributes primarily to maintaining tissue integrity by preventing leakage between adjacent cells?
सही उत्तर: घ) d) Tight junctions
Tight junctions (option d) are specialized structures that create a seal, preventing passage of molecules between epithelial cells. Gap junctions facilitate communication, desmosomes provide strong adhesion, and adherens junctions connect to the cytoskeleton.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of metamorphosis observed in amphibians such as frogs involves significant changes in body form. Which of the following best describes the primary driving force behind this transformation?
सही उत्तर: ख) b) Hormonal regulation, primarily driven by thyroid hormones.
Option (b) is correct; thyroid hormone levels are crucial for initiating and controlling amphibian metamorphosis. Option (a) describes general growth, option (c) implies random genetic changes, and option (d) doesn’t explain the organized developmental shift.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process by which a single cell divides into two identical daughter cells is called: (A) Meiosis (B) Fertilization (C) Mitosis (D) Replication
सही उत्तर: घ) (D) Replication
Mitosis is a type of cell division that results in two genetically identical daughter cells from a single parent cell. Meiosis produces gametes with half the number of chromosomes; fertilization involves fusion of gamete nuclei; replication refers to DNA duplication.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the function of the lateral line system in fish? (A) Detection of light intensity (B) Maintenance of buoyancy (C) Sensing vibrations and pressure changes in water (D) Hearing underwater sounds
सही उत्तर: घ) (D) Hearing underwater sounds
The lateral line system is a sensory organ found in fish that detects hydrodynamic disturbances (vibrations and pressure gradients) in the surrounding water. This allows them to sense prey, predators, and navigate. Light detection, buoyancy regulation, and hearing are not functions of this system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of budding in yeast is an example of: (A) Mitosis (B) Meiosis (C) Asexual reproduction (D) Sexual reproduction
सही उत्तर: घ) (D) Sexual reproduction
Budding is a form of asexual reproduction where a new organism develops as an outgrowth or bud from the parent. Mitosis involves cell division for growth and repair; meiosis produces gametes during sexual reproduction; sexual reproduction requires fusion of gametes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the function of platelets in blood? (A) Transporting oxygen from lungs to tissues (B) Initiating blood clotting (C) Producing red blood cells (D) Maintaining a constant body temperature
सही उत्तर: ख) (B) Initiating blood clotting
Platelets are crucial for hemostasis (blood clotting). They aggregate at the site of injury and release factors that initiate the cascade of events leading to clot formation. Options A, C, and D represent functions of red blood cells, bone marrow, and thermoregulation respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The highest degree of cephalization is observed in: (A) Roundworms (B) Annelids (C) Chordates (D) Arthropods
सही उत्तर: ग) (C) Chordates
Chordates exhibit the highest degree of cephalization, meaning a greater concentration of nervous tissue and sensory organs at the head. Roundworms (annelids are segmented worms, arthropods have exoskeletons and segmented bodies, but lack this extreme concentration). Cephalization is key to complex behavior and rapid response to stimuli.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures in the human eye is most directly responsible for focusing light onto the retina?
सही उत्तर: ग) C) Lens
The lens is a flexible structure that changes shape to focus light accurately on the retina. The cornea also contributes to refraction but the lens's ability to change shape (accommodation) is crucial for vision at different distances; options A refers to the outer covering, option B controls the amount of light entering, and option D is an aperture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The symbiotic relationship between nitrogen-fixing bacteria and leguminous plants plays a crucial role in ecosystem nutrient cycling. What specific molecule is produced by these bacteria that benefits the plant?
सही उत्तर: ख) B) Nitrate, a form of nitrogen essential for plant growth.
Nitrogen-fixing bacteria convert atmospheric nitrogen into ammonia (which is then converted to nitrate), a form of nitrogen that plants can readily absorb and use for growth. Options A, C and D are related to other plant processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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