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
-
During muscle contraction, calcium ions bind to:
सही उत्तर: ख) Troponin
Ca2+ binds troponin, causing tropomyosin to shift and expose myosin-binding sites on actin. Myosin heads then form cross-bridges.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The functional unit of a skeletal muscle myofibril is the:
सही उत्तर: क) Sarcomere
A sarcomere is the region between two successive Z-lines and is the contractile unit. The sarcoplasmic reticulum stores calcium ions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The normal glomerular filtration rate (GFR) in a healthy adult is about:
सही उत्तर: घ) 125 mL per minute
GFR is about 125 mL/min, or roughly 180 L/day, of which about 99% is reabsorbed. Normal urine output is only about 1.5 L/day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Antidiuretic hormone (ADH) increases water reabsorption mainly in the:
सही उत्तर: ग) Distal tubule and collecting duct
ADH (vasopressin) makes the DCT and collecting duct more permeable to water, producing concentrated urine. Its deficiency causes diabetes insipidus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Maximum reabsorption of glucose and amino acids from glomerular filtrate occurs in the:
सही उत्तर: ख) Proximal convoluted tubule
The PCT, lined by brush-bordered cuboidal cells, reabsorbs nearly all glucose and amino acids and most water and salts. The DCT does fine-tuning under hormonal control.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Ultrafiltration of blood in the kidney occurs in the:
सही उत्तर: क) Glomerulus (Malpighian body)
High hydrostatic pressure in glomerular capillaries forces fluid into Bowman's capsule. The loop of Henle is concerned with concentrating urine, not filtration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Urea is synthesised in the human body in the:
सही उत्तर: घ) Liver
The ornithine (urea) cycle operates in liver cells, converting ammonia and CO2 into urea. The kidneys only filter and excrete urea.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The main nitrogenous waste excreted by humans is:
सही उत्तर: ग) Urea
Humans are ureotelic; urea is formed in the liver by the ornithine cycle. Birds and reptiles are mainly uricotelic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Normal cardiac output of a resting adult is approximately:
सही उत्तर: ख) 5 litres per minute
Cardiac output = stroke volume x heart rate, about 70 mL x 72 beats/min, which is roughly 5 L/min. It can increase several-fold during exercise.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Which blood vessel carries oxygenated blood from the lungs to the heart?
सही उत्तर: क) Pulmonary vein
Pulmonary veins return oxygenated blood to the left atrium, an exception to the rule that veins carry deoxygenated blood. The pulmonary artery carries deoxygenated blood to the lungs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।