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 process of osmosis plays a crucial role in water movement within plant tissues. Which statement best describes this process?
सही उत्तर: ख) Water moves from an area of low solute concentration to high solute concentration.
Osmosis describes the movement of water across a semi-permeable membrane from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration). This ensures cells remain turgid and healthy. The other options describe different types of diffusion or pressure-based phenomena.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During the formation of a seed, what is the primary role of the endosperm?
सही उत्तर: ग) Serving as an initial food reserve for the embryo.
The endosperm is rich in starch and other nutrients, providing the essential food reserves that nourish the developing embryo until it establishes itself as a seedling. While it does contribute to structural support initially, its primary function is as a food source. The other options describe different aspects of seed development.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the function of chlorophyll molecules within chloroplasts?
सही उत्तर: ख) They absorb light energy required for photosynthesis.
Chlorophyll absorbs specific wavelengths of light, primarily red and blue, which drives the process of photosynthesis. This absorbed light energy is then used to convert carbon dioxide and water into glucose and oxygen. The other options describe unrelated cellular processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of transpiration in plants primarily leads to the loss of which substance from leaf cells?
सही उत्तर: ग) Water Vapor (H2O)
Transpiration is the evaporation of water from plant leaves, primarily through stomata. This results in a significant loss of water vapor. The other options are involved in photosynthesis or carbohydrate metabolism but not directly linked to the core process of transpiration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a defining characteristic of C₄ plants in terms of their photosynthetic carbon fixation pathway?
सही उत्तर: ग) They initially fix CO₂ into a four-carbon compound before producing sugars
C₄ plants employ a unique two-step carbon fixation process initiated by the enzyme PEP carboxylase, which first fixes CO₂ into a four-carbon molecule (oxaloacetate) before it's broken down to produce sugars. RuBisCO is used in C₃ plants.”} , 3, 2, 1]}
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'Yarsagumba' product is a composite of which two biological components?
सही उत्तर: ख) Pollen and Fungus
Yarsagumba (also known as ‘Corpse Flower’) consists of the fruiting body of the Cordyceps fungus, which parasitizes insects, and the male reproductive organs of the insect host. The other options represent different plant parts or fungal structures.”} , 3, 2, 1],
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the primary role of coleoptile in a seedling?
सही उत्तर: ख) To facilitate photosynthesis within the young shoot
The coleoptile is a protective sheath surrounding the young shoot (plumule) of a plant. It shields it from physical damage as it pushes through the soil. Photosynthesis primarily occurs in leaves, while roots absorb water and minerals.”} , 3, 2, 1],
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process by which plants absorb water through their roots and subsequently lose it as a liquid through specialized structures on the leaf surface is known as:
सही उत्तर: क) Transpiration
Guttation is specifically defined as the loss of water in droplet form from plant leaves, primarily due to root pressure. Transpiration involves water vapor loss via stomata, respiration uses oxygen and produces carbon dioxide, and photosynthesis converts light energy into chemical energy.”} , 5, 4, 3, 2, 1],
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is primarily responsible for the opening and closing of stomata, regulating gas exchange and transpiration in plants?
सही उत्तर: ख) Guard Cells
Guard cells are specialized cells that actively respond to environmental stimuli (like light and water availability) by changing their turgor pressure, which directly controls the opening and closing of stomata. Chloroplasts conduct photosynthesis, xylem transports water, and phloem transports sugars – these do not regulate stomatal movement.”}],
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The characteristic olive-green to brown color of brown algae (Phaeophyceae) is primarily due to the presence of: (A) Chlorophyll a and chlorophyll c (B) Carotenoids, specifically fucoxanthin (C) Phycoerythrin pigments (D) Anthocyanins
सही उत्तर: ग) (C) Phycoerythrin pigments
Brown algae contain significant amounts of fucoxanthin, a carotenoid pigment that absorbs blue-green light and reflects green and brown wavelengths, resulting in the characteristic color. Options (A) and (C) describe other pigments found in different algal groups.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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