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 notochord is retained throughout life in:
सही उत्तर: घ) Amphioxus
In cephalochordates like Amphioxus the notochord extends from head to tail and persists throughout life. In vertebrates it is replaced by the vertebral column.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of these animals is oviparous yet is a mammal?
सही उत्तर: ग) Duck-billed platypus
The platypus is a monotreme (Prototheria) that lays eggs. The kangaroo is a marsupial that gives birth to immature young carried in a pouch.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Radula, a rasping organ for feeding, is found in:
सही उत्तर: ख) Mollusca
The radula is a file-like ribbon of teeth found in the mouth of most molluscs, such as snails. Echinoderms like sea urchins instead have Aristotle's lantern.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water vascular system is a characteristic feature of:
सही उत्तर: क) Echinodermata
Echinoderms such as starfish have a water vascular system that operates their tube feet for locomotion and feeding. The canal system of sponges is a different structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many pairs of spiracles are present in the cockroach?
सही उत्तर: घ) 10
The cockroach has 10 pairs of spiracles: 2 thoracic and 8 abdominal. They open into the tracheal system for respiration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The open circulatory system with a haemocoel is characteristic of:
सही उत्तर: ग) Cockroach
Arthropods like the cockroach have an open circulation in which haemolymph bathes organs in the haemocoel. The earthworm has a closed circulatory system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The excretory organs of the earthworm are:
सही उत्तर: ख) Nephridia
Earthworms excrete through septal, integumentary and pharyngeal nephridia. Malpighian tubules are found in insects such as the cockroach.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Metameric segmentation is first seen in which phylum?
सही उत्तर: क) Annelida
Annelids (e.g., earthworm) are the first animals with true metameric segmentation. Tapeworm 'segments' (proglottids) are not true metameres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The body cavity of Ascaris is a:
सही उत्तर: घ) Pseudocoelom
Nematodes like Ascaris have a pseudocoelom, which is not fully lined by mesoderm. A true coelom first appears in annelids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flame cells are the excretory structures of:
सही उत्तर: ग) Platyhelminthes
Flatworms such as Planaria and Taenia excrete through protonephridia bearing flame cells. Annelids use nephridia, not flame cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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