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 characteristics is most diagnostic for identifying a monocot stem in cross-section? (A) Vascular bundles arranged in a ring. (B) Scattered vascular bundles. (C) A distinct cambium layer. (D) Vascular bundles surrounded by a fibrous root sheath.
सही उत्तर: ग) (C) A distinct cambium layer.
Monocot stems have scattered vascular bundles throughout the stem tissue, unlike dicots which arrange them in a ring. Option (A) describes dicot stems and (C) is incorrect; monocots lack a cambium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary photosynthetic product in C3 plants during daylight hours is typically: (A) Fructose (B) Glucose (C) Starch (D) Sucrose
सही उत्तर: ख) (B) Glucose
Glucose is the primary product of photosynthesis in C3 plants. Fructose and sucrose are intermediate compounds involved in carbon metabolism. Starch is a storage form created later.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of stomata in plant leaves is to regulate:
सही उत्तर: ख) Water loss through transpiration
Stomata are pores that control the exchange of gases, primarily facilitating transpiration (water loss) while allowing carbon dioxide intake for photosynthesis. The other options describe different plant functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of apical dominance, where a terminal bud suppresses the growth of lateral buds, is primarily controlled by which hormone?
सही उत्तर: ख) Cytokinin
Cytokinins are known to promote lateral bud development and counteract apical dominance. While auxin plays a role in overall plant growth, it's not the primary regulator of this specific phenomenon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures primarily facilitates the movement of water and minerals from the roots to the stem and leaves in a plant?
सही उत्तर: क) Root hairs
Xylem vessels are specialized cells specifically designed for conducting water and minerals upwards. The other options – root hairs, phloem tubes, and the cuticle layer – have different primary functions within the plant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of transpiration in plants primarily serves which function? A. To absorb carbon dioxide from the atmosphere. B. To regulate plant temperature by cooling the leaf surface. C. To synthesize proteins within the plant cells. D. To attract pollinators to the flower.
सही उत्तर: ख) To regulate plant temperature by cooling the leaf surface
Transpiration, the loss of water vapor through stomata, generates a pulling force (transpirational gradient) that drives water uptake from the soil. Options A and D describe other functions of transpiration or related processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is primarily involved in water transport within a plant? A. Phloem B. Cambium C. Xylem D. Epidermis
सही उत्तर: ग) Xylem
Xylem vessels are highly specialized for the efficient translocation of water from the roots to the leaves, utilizing cohesion and adhesion properties. Phloem is dedicated to sugar transport.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process by which plants synthesize their own food from sunlight, carbon dioxide, and water is called: A. Transpiration B. Respiration C. Photosynthesis D. Germination
सही उत्तर: ग) Photosynthesis
Photosynthesis is the fundamental process by which plants convert light energy into chemical energy in the form of glucose. Options A, B, and D represent other biological processes – transpiration (water loss), respiration (energy breakdown), and germination (seed sprouting) respectively - that are not the primary food production mechanism.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of CAM (Crassulacean Acid Metabolism) photosynthesis? (a) It occurs exclusively during daylight hours. (b) It involves carbon fixation during the day and sugar production at night. (c) It relies on high rates of oxygen consumption. (d) It is a type of photosynthesis found only in aquatic plants.
सही उत्तर: ख) (b) It involves carbon fixation during the day and sugar production at night
CAM photosynthesis is characterized by opening stomata at night to fix carbon dioxide and then using this stored carbon during the day for photosynthesis. This minimizes water loss under hot, dry conditions, making it efficient in succulents like cacti and certain herbs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of transpiration in plants is primarily influenced by: (a) Increased carbon dioxide concentration (b) Reduced root pressure (c) Humidity and temperature (d) Decreased sunlight intensity
सही उत्तर: ग) (c) Humidity and temperature
Transpiration – the evaporation of water from plant leaves – is directly affected by environmental conditions like humidity and temperature. High humidity reduces the rate of transpiration, while increased temperature promotes it. Carbon dioxide levels and sunlight intensity have minimal direct impact.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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