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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The dark, central, non-conducting wood of an old tree trunk, filled with tannins and resins, is called:
सही उत्तर: ग) Heartwood (duramen)
Heartwood is the inner, dead, darker wood; the outer functional wood is sapwood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mustard belongs to the family:
सही उत्तर: घ) Brassicaceae (Cruciferae)
Mustard, cabbage and radish are members of Brassicaceae, with cross-shaped (cruciform) corollas.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vessels are generally absent in the xylem of:
सही उत्तर: ग) Gymnosperms
Gymnosperm xylem consists mainly of tracheids; vessels are characteristic of angiosperms (Gnetum is an exception).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In roots, xylem and phloem lie on different radii alternating with each other. Such vascular bundles are called:
सही उत्तर: ग) Radial
Roots have radial vascular bundles where xylem and phloem strands alternate on separate radii.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vascular bundles of a dicot stem are described as:
सही उत्तर: क) Conjoint, collateral and open
Dicot stem bundles have xylem and phloem on the same radius (conjoint, collateral) with cambium between them (open).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which feature is typical of a monocotyledonous plant?
सही उत्तर: ग) Parallel venation in leaves
Monocots usually have parallel venation, fibrous roots, scattered vascular bundles and trimerous flowers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Transfer of pollen grains from the anther to the stigma of another flower on the same plant is called:
सही उत्तर: ग) Geitonogamy
Geitonogamy is functionally cross-pollination but genetically like selfing, since both flowers are on the same plant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pollination by water, as seen in Vallisneria, is called:
सही उत्तर: ग) Hydrophily
Hydrophily is pollination by water; Vallisneria releases male flowers that float to female flowers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Formation of seeds without fertilisation, seen in some grasses and citrus, is known as:
सही उत्तर: घ) Apomixis
Apomixis is asexual seed formation that mimics sexual reproduction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Development of fruit without fertilisation, giving seedless fruits such as banana, is called:
सही उत्तर: क) Parthenocarpy
Parthenocarpy produces fruits without fertilisation, so they lack seeds.
💬 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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