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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Vexillary (papilionaceous) aestivation, with a large standard petal overlapping two wings that overlap two keel petals, is characteristic of:
सही उत्तर: क) Pea and bean
Vexillary aestivation is typical of the subfamily of Fabaceae (pea, bean); China rose shows twisted and Calotropis valvate aestivation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Free central placentation, where ovules are borne on a central axis without septa, is found in:
सही उत्तर: ग) Dianthus and Primrose
In Dianthus and Primrose the septa are absent and ovules are on a free central column; mustard is parietal and sunflower basal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In pea, the ovules are borne along the ventral suture of a single-chambered ovary. This placentation is:
सही उत्तर: क) Marginal
Marginal placentation, with ovules along the junction of the margins of a single carpel, is typical of legumes like pea.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In pteridophytes such as ferns, the main plant body is the:
सही उत्तर: क) Diploid sporophyte
In pteridophytes the dominant plant with roots, stem and leaves is the diploid sporophyte; the gametophyte is a small prothallus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gemma cups, which bear gemmae for vegetative reproduction, are found on the thallus of:
सही उत्तर: घ) Marchantia
The liverwort Marchantia produces multicellular gemmae in cup-like structures on the dorsal surface of its gametophytic thallus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reserve food materials of brown algae (Phaeophyceae) are:
सही उत्तर: घ) Laminarin and mannitol
Brown algae store carbohydrate as laminarin and mannitol; red algae store floridean starch and green algae store starch.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The genetic material of tobacco mosaic virus (TMV) is:
सही उत्तर: ग) Single-stranded RNA
TMV is a rod-shaped plant virus with a single-stranded RNA genome surrounded by a protein coat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Deuteromycetes are called 'fungi imperfecti' because:
सही उत्तर: ग) Their sexual stage is not known
Only the asexual (imperfect) stages of these fungi are known; when a sexual stage is found they are moved to another class.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mushrooms (Agaricus), rusts (Puccinia) and smuts (Ustilago) belong to the class:
सही उत्तर: घ) Basidiomycetes
These fungi produce sexual spores (basidiospores) on club-shaped basidia, the defining feature of Basidiomycetes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The common bread mould Rhizopus belongs to the fungal class:
सही उत्तर: ग) Phycomycetes
Rhizopus and Mucor are phycomycetes (zygomycetes) with aseptate, coenocytic hyphae and zygospores.
💬 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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