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 presence of a large number of erythrocytes (red blood cells) in the blood is primarily due to: (a) Increased production of erythropoietin. (b) Decreased destruction of red blood cells. (c) Reduced synthesis of hemoglobin. (d) Decreased plasma volume.
सही उत्तर: ख) Decreased destruction of red blood cells.
Erythropoiesis (red blood cell formation) is stimulated by the hormone erythropoietin produced primarily by the kidneys in response to low oxygen levels. This increased production compensates for any loss of red blood cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which cell type is primarily responsible for initiating an adaptive immune response against foreign antigens? (a) Macrophages (b) Neutrophils (c) B lymphocytes (d) Eosinophils
सही उत्तर: ग) B lymphocytes
B lymphocytes are the key cells of the adaptive immune system. Upon encountering an antigen, they differentiate into plasma cells that produce antibodies to specifically target and neutralize the foreign substance. Macrophages engulf pathogens but don’t initiate antibody production, Neutrophils and Eosinophils are part of innate immunity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of metamorphosis observed in amphibians like tadpoles involves a significant change in: (a) The digestive system solely, leading to increased nutrient absorption. (b) Body form and physiology, including the development of limbs and gills. (c) Neural pathways exclusively, resulting in enhanced sensory perception. (d) Cellular differentiation mainly, causing tissue proliferation.
सही उत्तर: ख) Body form and physiology, including the development of limbs and gills.
Metamorphosis in amphibians is a complex developmental process that involves dramatic changes in their body structure and function. The transformation from an aquatic larva (tadpole) to a terrestrial adult includes the development of limbs, lungs, and other adaptations. This encompasses both form and physiological changes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of hemocyanin in mollusks? (a) It transports oxygen using iron ions. (b) It binds to carbon dioxide and facilitates its removal. (c) It carries oxygen bound to copper ions. (d) It plays no direct role in oxygen transport.
सही उत्तर: ग) It carries oxygen bound to copper ions.
Hemocyanin is a copper-containing protein found in the blood of mollusks (like octopuses and snails). It binds to oxygen, allowing for oxygen transport. Iron-based hemoglobin is found in vertebrates. The other options describe functions unrelated to hemocyanin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of the goblet cells found in the human respiratory tract is to: (a) Produce mucus that traps foreign particles. (b) Stimulate cilia movement for efficient removal of debris. (c) Transport oxygen from alveoli to capillaries. (d) Secret histamine to induce inflammation.
सही उत्तर: क) Produce mucus that traps foreign particles.
Goblet cells are specialized epithelial cells in the respiratory tract that secrete mucus. This mucus acts as a sticky layer, trapping inhaled particles such as dust and pathogens. The other options describe functions of different cell types or processes within the respiratory system (cilia movement is performed by ciliated epithelial cells).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the role of macrophages in the immune system?
सही उत्तर: ख) They engulf and destroy pathogens and cellular debris
Macrophages are phagocytic cells that play a crucial role in innate immunity by engulfing and destroying foreign invaders like bacteria, viruses, and dead cells. They are essential for initiating immune responses. Antibody production is primarily done by B cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ‘fight-or-flight’ response, mediated by the sympathetic nervous system, primarily involves the release of which hormone?
सही उत्तर: ग) Adrenaline (Epinephrine)
Adrenaline is a key hormone released during the fight-or-flight response, increasing heart rate, blood pressure and energy availability. Insulin regulates glucose metabolism, cortisol is involved in stress responses related to long-term adaptation, and melatonin regulates circadian rhythms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is an example of convergent evolution?
सही उत्तर: घ) The independent evolution of similar traits in unrelated organisms facing similar environmental pressures
Convergent evolution occurs when two or more unrelated species evolve similar traits as a result of adapting to similar environments. The example provided – camouflage patterns – is a classic illustration. Bats and birds evolved wings independently, while sharks and dolphins share a body shape due to marine environment adaptation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of specialized junctions called ‘tight junctions’ between epithelial cells lining the small intestine primarily serves to:
सही उत्तर: घ) Facilitate communication between adjacent epithelial cells
Tight junctions are specialized cell junctions that create a barrier, preventing leakage between epithelial cells. This is crucial for maintaining the proper microenvironment in the intestinal lumen. The other options describe different aspects of intestinal function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements correctly describes the function of goblet cells found in the respiratory tract?
सही उत्तर: क) They secrete mucus to trap pathogens and debris
Goblet cells are epithelial cells that line the airways and secrete mucus, which traps inhaled particles. This is a key protective function. The other options describe functions of different cell types or processes within the lungs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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