कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान प्रवेश: 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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Opening of stomata is mainly caused by the influx of which ion into the guard cells?
सही उत्तर: ख) K+
Uptake of potassium ions lowers the water potential of guard cells, water enters, the guard cells become turgid and the pore opens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water potential of pure water at standard atmospheric pressure is:
सही उत्तर: घ) Zero
Pure water is taken as the reference with a water potential of zero; adding solutes makes it negative.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Guttation, the loss of water as liquid drops from leaf margins, occurs through:
सही उत्तर: क) Hydathodes
Guttation happens through hydathodes (water pores) at leaf tips and margins, usually at night when root pressure is high, as in grasses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a dicot root, lateral roots arise from the:
सही उत्तर: ख) Pericycle
Lateral roots originate endogenously from the pericycle cells opposite the protoxylem.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Casparian strips, thickened with suberin, are found in the cells of the:
सही उत्तर: ख) Endodermis
Endodermal cells of the root have suberin bands (Casparian strips) on their radial and tangential walls that block apoplastic water movement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Peat, used as fuel and as packing material, is obtained from the moss:
सही उत्तर: घ) Sphagnum
Partly decomposed Sphagnum (peat moss) accumulates as peat; Sphagnum also holds water, so it is used for packing living material.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first terrestrial plants to possess vascular tissues (xylem and phloem) were the:
सही उत्तर: घ) Pteridophytes
Pteridophytes (ferns, horsetails, club mosses) are the first land plants with true vascular tissue, though they have no seeds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which group of plants is called the 'amphibians of the plant kingdom'?
सही उत्तर: ख) Bryophytes
Bryophytes live on land but need water for fertilisation, as their sperms swim to the egg, hence the name.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coralloid roots of Cycas are associated with:
सही उत्तर: ग) Nitrogen-fixing cyanobacteria
Coralloid roots of Cycas harbour nitrogen-fixing cyanobacteria such as Anabaena and Nostoc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In gymnosperms, the endosperm (female gametophyte tissue) is:
सही उत्तर: ख) Haploid
Gymnosperm endosperm is the female gametophyte formed before fertilisation from a haploid megaspore, so it is haploid.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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