जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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 animals has a closed circulatory system?
सही उत्तर: ग) Earthworm
In the earthworm blood flows within vessels throughout, so the system is closed; arthropods and most molluscs have open systems.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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True metameric segmentation of the body first appears in which phylum?
सही उत्तर: क) Annelida
Annelids are the first animals to show true metamerism, the body being divided into similar segments (metameres).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Animals that are triploblastic and bilaterally symmetrical but have no body cavity (acoelomate) belong to:
सही उत्तर: ग) Platyhelminthes
Flatworms are triploblastic, bilaterally symmetrical and acoelomate; the space between body wall and gut is filled with mesenchyme (parenchyma).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the earthworm Pheretima, the clitellum covers which segments?
सही उत्तर: घ) 14th to 16th
The clitellum, a glandular band that forms the cocoon, covers segments 14 to 16 in Pheretima.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tubular heart of a cockroach consists of how many funnel-shaped chambers?
सही उत्तर: ख) 13
The cockroach heart is an elongated dorsal tube with 13 funnel-shaped chambers bearing ostia on each side.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following mammals lays eggs?
सही उत्तर: क) Duck-billed platypus
The platypus (Ornithorhynchus) is a monotreme, an egg-laying (oviparous) mammal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The intermediate host of the pork tapeworm Taenia solium is the:
सही उत्तर: घ) Pig
Humans are the definitive host of Taenia solium; the pig harbours the larval cysticercus stage, so pig is the intermediate host.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The infective filariform larva of the human hookworm (Ancylostoma duodenale) usually enters the body by:
सही उत्तर: ग) Penetrating the skin, often of bare feet
Hookworm larvae in soil penetrate the skin, commonly of the feet of people walking barefoot.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heart of a typical bony fish such as rohu has:
सही उत्तर: ग) One atrium and one ventricle
Fishes have a two-chambered heart with one atrium and one ventricle that pumps only deoxygenated blood (single circulation).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In which chordate does the notochord extend from head to tail and persist throughout life?
सही उत्तर: घ) Branchiostoma (Amphioxus)
In cephalochordates such as Branchiostoma the notochord runs from head to tail and persists throughout life, unlike urochordates where it is only in the larval tail.
💬 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।
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