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 characteristic gritty texture observed in the edible pulp of pear and guava fruits is primarily due to the presence of: (a) Cellulose (b) Sclerenchyma cells (c) Stone Cells (Druses) (d) Parenchyma cells
सही उत्तर: ग) (c) Stone Cells (Druses)
Stone cells, also known as druses, are calcium carbonate crystals that give fruits like pear and guava their distinctive gritty texture. The other options represent different tissue types with different functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The archespore mother cell in a sporophyte undergoes meiosis to produce haploid cells, which differentiate into: (a) Gametocytes (b) Pollen grains (c) Microspores (d) Megaspores
सही उत्तर: घ) (d) Megaspores
The archespore mother cell is a specialized cell that undergoes meiosis to produce microspores, which are the male gametophytes in gymnosperms. Options (a), (b), and (d) relate to different types of spores or gametes produced in other plant groups.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a cross between two plants with genotypes AaBbCc and AaBbCc, what proportion of the F2 generation will have the genotype AabbCC? (a) 1/8 (b) 3/8 (c) 1/4 (d) 9/16
सही उत्तर: ख) (b) 3/8
With independent assortment, each gene segregates independently during gamete formation. The probability of obtaining a specific genotype from this trihybrid cross is calculated based on the probabilities of each allele combining. 1/8 accurately represents this outcome (one out of eight possible combinations). Options (b), (c) and (d) are incorrect proportions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the primary function of root hairs? (a) Photosynthesis (b) Nutrient Absorption (c) Water Storage (d) Structural Support
सही उत्तर: ख) (b) Nutrient Absorption
Root hairs are highly specialized epidermal cells that significantly increase the surface area for water and mineral absorption from the soil, which is their primary function. Options (a), (c), and (d) represent other plant functions or structural components.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon where cells in a plant embryo differentiate into different types of tissues during seed development is called: (a) Opisthoglosson (b) Placentation (c) Endosperm Formation (d) Embryo Sac Development
सही उत्तर: ख) (b) Placentation
Placentation describes the arrangement of ovules within the ovary. This is the correct definition and aligns with established botanical terminology. Options (a), (c), and (d) refer to different developmental stages or structures, making them plausible but ultimately incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What type of aestivation is characterized by overlapping floral segments, resulting in a curved or folded leaf base?
सही उत्तर: ख) Twisted Aestivation
Twisted aestivation (option 2) describes the arrangement of petal bases where they overlap, forming a twisted or rolled appearance. Superspecific aestivation (option 1) involves distinct, separate segments while water droplet and open aestivation refer to different arrangements with no overlapping.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The periderm formed during secondary growth consists of: (A) Only xylem cells (B) Primarily phloem cells and parenchyma cells (C) Cork cambium, phelloderm, and cork cells (D) Only sclerenchyma cells
सही उत्तर: ग) (C) Cork cambium, phelloderm, and cork cells
The periderm is the protective outer layer of stems and roots that develops during secondary growth. It's composed of several cell types including the cork cambium (which produces new cork cells), phelloderm (parenchyma cells), and cork cells themselves. This accurately reflects option (C).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The light reactions of photosynthesis occur in the: (A) Stroma (B) Thylakoid membranes (C) Cell membrane (D) Cytoplasm
सही उत्तर: ख) (B) Thylakoid membranes
The light-dependent reactions of photosynthesis take place within the thylakoid membranes of chloroplasts. These membranes contain chlorophyll and other pigments necessary for capturing light energy. The stroma is where the Calvin cycle occurs, while the cytoplasm is involved in various cellular processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Free central placentation is found in: (A) Pea (B) Apple (C) Citrus (D) Tulip
सही उत्तर: ख) (B) Apple
Free central placentation refers to the arrangement of floral parts where the ovary is located in the center of the flower and does not have any specific connection with other floral organs. Apple plants exhibit this characteristic arrangement, making option (B) correct. Pea plants have terminal placentation, Citrus has axile placentation, and Tulip plants have a different floral structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A plant species exhibits a phenomenon where the development of lateral buds is suppressed, leading to a more upright growth habit. Which physiological mechanism primarily causes this?
सही उत्तर: क) A) Auxin dominance – high auxin concentrations inhibit bud development.
Option A is correct; Auxin plays a key role in apical dominance, suppressing lateral bud growth. The other options describe different hormone functions related to plant development or senescence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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