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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Hydrochloric acid in the human stomach is secreted by the:
सही उत्तर: ग) Parietal (oxyntic) cells
Parietal or oxyntic cells of the gastric glands secrete HCl and intrinsic factor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body cavity that is not fully lined by mesoderm (pseudocoelom) is found in:
सही उत्तर: क) Ascaris (roundworm)
In Aschelminthes such as Ascaris the mesoderm is present in scattered pouches between ectoderm and endoderm, forming a pseudocoelom.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The inner surface of the trachea and bronchi is lined by:
सही उत्तर: ख) Pseudostratified ciliated columnar epithelium
The respiratory tract is lined by pseudostratified ciliated columnar epithelium with goblet cells that trap and sweep out dust.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mast cells of connective tissue secrete:
सही उत्तर: क) Histamine and heparin
Mast cells release histamine (a vasodilator in inflammation) and heparin (an anticoagulant).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ligament is a band of dense regular connective tissue that connects:
सही उत्तर: घ) Bone to bone
Ligaments join bone to bone at joints, while tendons attach skeletal muscles to bones.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the peripheral nervous system, the myelin sheath around axons is formed by:
सही उत्तर: ख) Schwann cells
Schwann cells wrap around peripheral axons to form myelin; oligodendrocytes do this in the central nervous system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bone-forming cells that secrete the bone matrix are called:
सही उत्तर: ग) Osteoblasts
Osteoblasts lay down bone matrix; osteoclasts resorb bone and chondrocytes are cartilage cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Intercalated discs, which allow cells to contract as a unit, are a distinguishing feature of:
सही उत्तर: क) Cardiac muscle
Intercalated discs are specialised junctions between cardiac muscle fibres that permit rapid spread of impulses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a cartilaginous fish (class Chondrichthyes)?
सही उत्तर: घ) Scoliodon (dogfish)
Scoliodon has a cartilaginous endoskeleton and placoid scales; rohu, catla and sea horse are bony fishes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hollow, air-filled (pneumatic) long bones are a characteristic feature of:
सही उत्तर: ख) Birds
Birds have pneumatic bones connected with air sacs, which lighten the body for flight.
💬 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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