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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Casparian strips are found in the cell walls of the:
सही उत्तर: क) Endodermis
The endodermis has suberin-rich Casparian strips that block the apoplastic movement of water into the stele. The pericycle lies just inside the endodermis and gives rise to lateral roots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Companion cells in plants are closely associated with:
सही उत्तर: क) Sieve tubes
Companion cells are living phloem cells that support the enucleate sieve tube elements. Vessels and tracheids are dead xylem elements.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In plants, sugars are translocated through the phloem mainly in the form of:
सही उत्तर: घ) Sucrose
Sucrose is the main form in which carbohydrates move through the phloem. Starch is an insoluble storage form and cannot be translocated.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'bakanae' (foolish seedling) disease of rice led to the discovery of:
सही उत्तर: ख) Gibberellin
Rice seedlings infected by the fungus Gibberella fujikuroi grew abnormally tall because the fungus produced gibberellin. Auxin was discovered from studies of coleoptile phototropism.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gaseous plant hormone that promotes fruit ripening is:
सही उत्तर: ग) Ethylene
Ethylene is the only gaseous plant hormone and hastens ripening of fruits such as banana and mango. Auxin is commonly used for rooting of cuttings instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which plant hormone causes closure of stomata during water stress?
सही उत्तर: ख) Abscisic acid
Abscisic acid (ABA) is called the stress hormone; it causes stomatal closure and promotes dormancy. Cytokinins generally act opposite to ABA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The plant hormone that mainly promotes cell division is:
सही उत्तर: ख) Cytokinin
Cytokinins (e.g. kinetin, zeatin) promote cytokinesis and are used in tissue culture with auxin. Gibberellins mainly cause stem elongation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Photolysis of water during photosynthesis is associated with:
सही उत्तर: घ) Photosystem II
The oxygen-evolving complex of photosystem II splits water, releasing O2, protons and electrons. Photosystem I receives electrons later and reduces NADP+.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The final electron acceptor in aerobic respiration is:
सही उत्तर: ख) Oxygen
At the end of the electron transport chain, electrons are accepted by molecular oxygen, which forms water. NAD+ and FAD are electron carriers that pass electrons on, not final acceptors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Krebs cycle occurs in the:
सही उत्तर: क) Mitochondrial matrix
The enzymes of the Krebs (citric acid) cycle are located in the mitochondrial matrix. The electron transport chain is on the inner mitochondrial membrane.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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