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 statements correctly describes the role of CAM photosynthesis?
सही उत्तर: ख) It involves the initial fixation of carbon dioxide during the day, followed by its use at night.
CAM (Crassulacean Acid Metabolism) photosynthesis is defined by carbon dioxide fixation occurring primarily at night, minimizing water loss during the day – a key difference from other photosynthetic strategies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘etiolation’ in plants refers to:
सही उत्तर: ख) Rapid stem elongation due to insufficient light
Etiolation is the characteristic rapid, pale growth of a plant seedling deprived of sufficient light. The other options describe different physiological responses to light or nutrient availability.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘sink’ action in plant physiology refers to:
सही उत्तर: ख) The area where carbohydrates and other nutrients accumulate, attracting the flow of resources from elsewhere in the plant.
A ‘sink’ represents an area with high demand for sugars – typically fruits and developing seeds – that attracts the flow of assimilates (sugars) from photosynthetic sources elsewhere in the plant via phloem transport. Options 2, 3, and 4 describe other physiological processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘etiolation’ in plants refers to rapid stem elongation due to a lack of light. Which hormone primarily mediates this response?
सही उत्तर: ख) Gibberellins
Etiolation is characterized by excessive stem growth and pale leaves caused by a surge of gibberellins in the absence of sufficient light. The other hormones are involved in different plant processes like cell elongation, shoot initiation, and fruit ripening.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of 'crinkling' observed in young, herbaceous plant stems is primarily due to: (a) Excessive transpiration (b) The accumulation of gaseous products like ethanol and carbon dioxide within the stem cells (c) The breakdown of chlorophyll pigments (d) The rapid growth of epidermal cells
सही उत्तर: ख) The accumulation of gaseous products like ethanol and carbon dioxide within the stem cells
Crinkling is a result of gas build-up (ethanol and carbon dioxide) produced during respiration in the young stems. This pressure causes the stem to buckle. Excessive transpiration exacerbates this.
💬 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 continuously throughout the day and night. (b) It fixes carbon dioxide during the daytime, maximizing light capture. (c) It fixes carbon dioxide at night and minimizes water loss during the day. (d) It relies solely on chloroplasts within the mesophyll cells.
सही उत्तर: ग) It fixes carbon dioxide at night and minimizes water loss during the day
CAM photosynthesis is a specialized adaptation found in succulents to conserve water. It involves capturing CO2 at night and fixing it during the day, minimizing water loss due to stomatal closure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary photosynthetic pigment in plants is: (a) Carotene (b) Xanthophyll (c) Chlorophyll (d) Phycocyanin
सही उत्तर: ग) Chlorophyll
Chlorophyll is the primary pigment responsible for absorbing light energy during photosynthesis. Carotenes and Xanthophylls are accessory pigments; phycocyanins are primarily found in cyanobacteria.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements correctly describes the role of xylem tissue in a plant? (a) It transports sugars from source to sink. (b) It facilitates gas exchange between the atmosphere and the leaf. (c) It conducts water and minerals upwards from the roots. (d) It provides structural support throughout the plant.
सही उत्तर: ग) It conducts water and minerals upwards from the roots
Xylem tissue is specifically designed for the vascular transport of water and dissolved mineral salts from the root to the rest of the plant. The other options describe the functions of phloem and collenchyma respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting light energy into chemical energy within plant cells is termed: (a) Respiration (b) Photosynthesis (c) Translocation (d) Germination
सही उत्तर: ख) Photosynthesis
Photosynthesis is the fundamental process by which plants convert light energy into chemical energy in the form of glucose. Respiration uses this energy; translocation moves substances within the plant; and germination is the sprouting of seeds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In plants, what is the primary significance of CAM (Crassulacean Acid Metabolism) photosynthesis? (a) Rapid carbon dioxide uptake during daylight hours (b) Water conservation in arid environments (c) Increased sugar production for rapid growth (d) Enhanced chlorophyll synthesis under intense sunlight
सही उत्तर: ख) (b) Water conservation in arid environments
CAM plants initially fix CO2 at night to minimize water loss, then use that stored CO2 for photosynthesis during the day. This adaptation is crucial in drought-prone conditions. (a), (c), and (d) describe processes not directly related to the CAM strategy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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