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 structures is MOST directly involved in the process of photosynthesis? (a) Stomata (b) Phloem (c) Chloroplast (d) Epidermis
सही उत्तर: ग) (c) Chloroplast
The chloroplast is the organelle within plant cells where photosynthesis takes place, housing chlorophyll and other pigments that capture light energy. Stomata regulate gas exchange, phloem transports nutrients, and the epidermis forms the outer layer of the leaf.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination in flowering plants can be primarily categorized into which two main types? (a) Vegetative and asexual reproduction (b) Self-pollination and cross-pollination (c) Conduction and absorption (d) Mitosis and meiosis
सही उत्तर: ख) (b) Self-pollination and cross-pollination
Pollination is differentiated by whether pollen reaches the stigma of the same or a different flower. Self-pollination occurs within the same plant, while cross-pollination involves transferring pollen from one plant to another. (a), (c), and (d) represent unrelated biological processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the function of xylem in vascular plants? (a) Transporting sugars from leaves to roots (b) Conducting water and minerals upwards from the roots to the rest of the plant (c) Absorbing carbon dioxide for photosynthesis (d) Providing structural support to the stem
सही उत्तर: ख) (b) Conducting water and minerals upwards from the roots to the rest of the plant
Xylem vessels are specialized tissues designed to transport water and dissolved mineral nutrients from the root system up throughout the plant. Options (a), (c), and (d) describe different processes, whilst (b) is the correct function of xylem.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of cutin in plant epidermis is to: (a) Facilitate gas exchange (b) Prevent water loss (c) Absorb sunlight (d) Provide structural support
सही उत्तर: ख) (b) Prevent water loss
Cutin is a waxy substance that forms the outermost layer of the epidermis, primarily acting as a barrier to reduce water evaporation from the plant. Options (a), (c), and (d) represent other functions or processes within plants, while (b) accurately describes the primary role of cutin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of a waxy cuticle on leaves helps plants to: (a) Increase their photosynthetic rate. (b) Reduce water loss through transpiration. (c) Absorb more sunlight for photosynthesis. (d) Enhance nutrient uptake from the soil.
सही उत्तर: ख) (b) Reduce water loss through transpiration.
The waxy cuticle is a protective layer that minimizes water evaporation from the leaf surface, conserving valuable water resources.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the role of xylem in plants? (a) It transports sugars produced during photosynthesis from leaves to other parts of the plant. (b) It transports water and mineral ions absorbed by roots to other parts of the plant. (c) It facilitates gas exchange between the atmosphere and photosynthetic cells. (d) It provides structural support to the plant stem and branches.
सही उत्तर: ख) (b) It transports water and mineral ions absorbed by roots to other parts of the plant.
Xylem is responsible for transporting water and dissolved minerals from the roots upwards throughout the plant. Sugars are transported via phloem.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination in orchids is a remarkable example of plant-pollinator mutualism. Which of the following best describes the primary mechanism involved? (a) Wind dispersal of pollen. (b) Insect attraction through vibrant floral colors and scents. (c) Direct transfer of pollen by water currents. (d) Self-pollination facilitated by specialized anthers.
सही उत्तर: ख) (b) Insect attraction through vibrant floral colors and scents.
Orchids have evolved intricate mechanisms to attract specific pollinators, typically insects, using elaborate flowers with strong fragrances and bright colors. Wind dispersal is a general method but not specific to orchids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the role of CAM photosynthesis in plants adapted to arid environments? (a) It occurs continuously throughout the day and night. (b) It involves opening stomata during the day to maximize carbon dioxide uptake. (c) It uses a specialized enzyme, RuBisCO, to fix carbon dioxide at night. (d) It allows for rapid carbon fixation in response to increased sunlight.
सही उत्तर: ग) (c) It uses a specialized enzyme, RuBisCO, to fix carbon dioxide at night.
CAM photosynthesis (Crassulacean Acid Metabolism) is characterized by opening stomata primarily at night to minimize water loss due to transpiration and storing the fixed carbon as malic acid. This contrasts with C3 and C4 photosynthesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is responsible for nutrient transport within a plant?
सही उत्तर: ख) Xylem
The phloem is the vascular tissue that transports sugars and other organic nutrients throughout the plant, from source to sink. Xylem transports water and minerals. The cuticle protects the leaf, and the epidermis covers the entire plant surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of photosynthesis involves light-dependent reactions which produce ATP and NADPH. Which plant hormone primarily regulates the opening and closing of stomata to balance carbon dioxide uptake and water loss?
सही उत्तर: ग) Abscisic Acid
Abscisic acid (ABA) is a key regulator of stomatal closure, responding to drought stress. The other hormones have different primary roles in plant development – auxin promotes cell elongation, cytokinins stimulate cell division, and gibberellins influence stem growth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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