वनस्पति विज्ञान – Botany – Botany MCQ
वनस्पति विज्ञान – Botany – CEE प्रवेश
Botany · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
वनस्पति विज्ञान – Botany: 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 phosphorus cycle differs from the carbon cycle in that it:
सही उत्तर: ख) has no significant gaseous phase in the atmosphere
Phosphorus cycles mainly between rocks, soil, water and organisms (a sedimentary cycle); there is no appreciable atmospheric reservoir.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cuscuta (dodder), a leafless yellow climber that draws food and water from its host through haustoria, is an example of a:
सही उत्तर: घ) total stem parasite
Cuscuta lacks chlorophyll and leaves and depends completely on the host plant through haustoria, so it is a total stem parasite.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Seed banks and botanical gardens are examples of:
सही उत्तर: ख) ex situ conservation
Ex situ conservation protects species outside their natural habitats, for example in seed banks, botanical gardens and zoos; national parks are in situ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a hydrarch succession that begins in a pond, the pioneer community usually consists of:
सही उत्तर: ग) phytoplankton
Hydrarch succession starts with phytoplankton, followed by submerged, floating and reed-swamp stages, eventually leading to a forest; lichens are pioneers on bare rock.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Net primary productivity (NPP) of an ecosystem is equal to:
सही उत्तर: क) gross primary productivity minus respiration losses of producers
NPP = GPP − R; it is the biomass available to heterotrophs (herbivores and decomposers).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a plant of genotype AaBbCc (three independently assorting genes) is self-pollinated, the proportion of offspring with genotype aabbcc is:
सही उत्तर: घ) 1/64
The probability of aa, bb and cc is 1/4 each, so P(aabbcc) = 1/4 × 1/4 × 1/4 = 1/64.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the F₂ generation of a trihybrid cross (AaBbCc × AaBbCc) with independent assortment and complete dominance, the number of different genotypes is:
सही उत्तर: ग) 27
Each gene gives 3 genotypes, so 3³ = 27 genotypes; there are 2³ = 8 phenotypes and 4³ = 64 gamete combinations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Mendel's monohybrid cross (Tt × Tt), the genotypic ratio in the F₂ generation is:
सही उत्तर: क) 1 : 2 : 1
The F₂ contains TT, Tt and tt in the ratio 1 : 2 : 1, while the phenotypic ratio (tall : dwarf) is 3 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In artificial hybridisation of a bisexual flower, the removal of anthers from the flower bud before they dehisce is called:
सही उत्तर: क) emasculation
Emasculation prevents self-pollination; the flower is then bagged to keep out unwanted pollen until the desired pollen is dusted on.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The weed whose pollen causes allergies and respiratory problems in many people, and which came to South Asia as a contaminant of imported wheat, is:
सही उत्तर: ख) Parthenium (carrot grass)
Parthenium hysterophorus (carrot grass) produces abundant allergenic pollen; it is believed to have arrived with imported wheat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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