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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Which of the following processes represents the primary pathway for the synthesis of complex organic molecules from inorganic sources within a plant? (A) Transpiration. (B) Respiration. (C) Photosynthesis. (D) Germination.
सही उत्तर: ग) (C) Photosynthesis.
Option (C) is correct – photosynthesis uses light energy to convert carbon dioxide and water into glucose and oxygen. This is the fundamental process by which plants create their own food. The other options describe different physiological processes like water loss, cellular respiration, and seed sprouting respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of apical dominance, where a primary shoot develops from an axillary bud, is primarily controlled by which plant hormone? (A) Ethylene. (B) Gibberellin. (C) Auxin. (D) Abscisic acid.
सही उत्तर: ग) (C) Auxin.
Option (C) is correct. Auxin, particularly indole-3-acetic acid (IAA), is the major hormone responsible for apical dominance. High concentrations of auxin produced by the shoot apex inhibit the growth of lateral buds, promoting the development of the main stem. The other hormones have distinct roles in plant physiology.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of CAM photosynthesis? (A) It occurs during daylight hours with high rates of carbon dioxide uptake. (B) It involves opening stomata throughout the day to maximize photosynthetic activity. (C) It allows plants to minimize water loss by fixing CO2 at night and using it for photosynthesis during the day. (D) It relies solely on the absorption of light energy for the initial steps of carbon fixation.
सही उत्तर: ग) (C) It allows plants to minimize water loss by fixing CO2 at night and using it for photosynthesis during the day.
Option (C) accurately describes CAM photosynthesis – a strategy employed by succulents and other plants to reduce water loss. They open their stomata at night to absorb CO2, storing it until daylight when they use it for photosynthesis. This avoids the direct exposure of stomata to sunlight and evaporation during hot, dry conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination, where pollen grains are transferred from the stamen to the pistil, can occur through various agents. Which of the following is an example of entomophily (pollination by insects)? (A) Wind pollination in grasses. (B) Pollen transfer by water currents. (C) Pollen transfer facilitated by bees and other insect pollinators. (D) Self-pollination within a flower’s own stamen and pistil.
सही उत्तर: ग) (C) Pollen transfer facilitated by bees and other insect pollinators.
Option (C) is correct as entomophily specifically refers to the pollination mechanism where insects, like bees, play a critical role in transferring pollen. Wind pollination (A), water currents (B) and self-pollination (D) represent other distinct pollination methods.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements regarding bryophytes is correct? (A) Bryophytes are well-differentiated into root, stem and leaf. (B) They possess a vascular system for efficient water transport. (C) They require an external medium for reproduction as they lack seeds. (D) They can perform photosynthesis effectively due to chloroplasts in their cells.
सही उत्तर: क) (A) Bryophytes are well-differentiated into root, stem and leaf.
Option (C) is correct. Bryophytes are non-vascular plants, meaning they lack a specialized system for transporting water and nutrients. This necessitates reliance on an external medium (like moisture) for reproduction – specifically the formation of spores. Options A, B and D represent features found in vascular plants like ferns or higher plants, not bryophytes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the significance of chalcone synthase (CHS) in plant biochemistry?
सही उत्तर: ग) It plays a central role in the synthesis of flavonoids and other aromatic compounds.
Chalcone synthase (CHS) is a key enzyme that catalyzes the first step in flavonoid biosynthesis. Flavonoids are a diverse group of plant pigments with various functions, including UV protection and defense mechanisms; therefore it’s central to aromatic compound synthesis. The other options describe different metabolic pathways.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary role of abscisic acid (ABA) in plant physiology is:
सही उत्तर: ग) Inducing dormancy and regulating stomatal closure.
Abscisic acid (ABA) is a crucial plant hormone involved in stress responses. Its primary function is to induce dormancy in seeds and buds by inhibiting growth processes and triggering stomatal closure to conserve water – essential for survival under unfavorable conditions. The other options represent the functions of different hormones.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of crassulacean acid metabolism (CAM) photosynthesis is most prominently found in which plant type?
सही उत्तर: ख) C4 Plants – Primarily at night.
Crassulacean acid metabolism (CAM) is a specialized photosynthetic pathway found in plants adapted to arid environments. It allows these plants to open their stomata at night to absorb carbon dioxide, minimizing water loss during the day – a key characteristic of C4 photosynthesis but performed uniquely by CAM plants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements regarding the root apical meristem (RAM) is correct?
सही उत्तर: ख) It contains stem cells that divide to produce new epidermal cells and vascular tissues.
The root apical meristem (RAM) is the region of active cell division at the tip of a growing root. It contains stem cells that continuously divide to generate new epidermal cells and vascular tissues, forming the root's structure. The other options describe incorrect roles or tissues associated with root growth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The symbiotic association between certain plant roots and fungi, known as mycorrhizae, is primarily beneficial for which aspect of the plant’s survival?
सही उत्तर: ख) B) Increasing the root surface area for enhanced water and nutrient absorption.
Mycorrhizal fungi extend hyphae into the soil, dramatically increasing the root's absorptive surface area. This allows for far more efficient uptake of water and minerals (especially phosphorus) from the soil – a key benefit for plant growth. Option A describes nitrogen fixation, C relates to defence mechanisms, and D refers to a general growth promotion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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