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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In the electron transport chain of aerobic respiration, the final electron acceptor is:
सही उत्तर: क) Oxygen
Electrons finally pass from cytochrome oxidase to molecular oxygen, which combines with protons to form water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemiosmotic hypothesis of ATP synthesis was proposed by:
सही उत्तर: ग) Peter Mitchell
Peter Mitchell proposed that a proton gradient across membranes drives ATP synthesis, earning the 1978 Nobel Prize.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reaction centre of photosystem I is the chlorophyll a molecule:
सही उत्तर: ख) P700
PSI has P700 at its reaction centre, absorbing light maximally at 700 nm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gibberellins were first discovered from a fungus causing the 'foolish seedling' (bakanae) disease in:
सही उत्तर: घ) Rice
Kurosawa found that Gibberella fujikuroi infected rice seedlings grew abnormally tall; the active substance was gibberellin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Giant polytene chromosomes are found in the:
सही उत्तर: क) Salivary glands of Drosophila larvae
Polytene chromosomes form by repeated DNA replication without cell division in larval salivary glands of dipteran insects.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The middle lamella that cements adjacent plant cells together is mainly made of:
सही उत्तर: घ) Calcium pectate
The middle lamella is composed mainly of calcium and magnesium pectate and holds neighbouring cells together.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The cell theory, stating that all living organisms are composed of cells, was formulated by:
सही उत्तर: ख) Schleiden and Schwann
Botanist M. Schleiden (1838) and zoologist T. Schwann (1839) jointly proposed the cell theory; Virchow later added that cells arise from pre-existing cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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August Weismann opposed Lamarck's theory by experimentally cutting the tails of mice for many generations and proposed the theory of:
सही उत्तर: ग) Continuity of germ plasm
Weismann found tails did not shorten and proposed that only changes in the germ plasm, not the body (somatoplasm), are inherited.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'coelacanth' Latimeria, often called a living fossil, is a:
सही उत्तर: क) Lobe-finned fish
Latimeria is a lobe-finned (crossopterygian) fish, a group thought to be related to the ancestors of land vertebrates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mendel chose the garden pea (Pisum sativum) for his experiments and studied how many pairs of contrasting characters?
सही उत्तर: घ) Seven
Mendel studied seven pairs of contrasting traits, such as tall/dwarf stem and round/wrinkled seed.
💬 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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