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 cellular structures plays a crucial role in maintaining the turgor pressure necessary for plant support?
सही उत्तर: ग) C) Collenchyma cells
Option C is correct because collenchyma cells have thickened cell walls that provide flexible support, maintaining turgor pressure. Option A relates to water transport, while B and D are involved in translocation or protection respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of multiple embryos within a single seed, as observed in Citrus and Mango, is termed:
सही उत्तर: क) A) Polyembryony
Option A (Polyembryony) is correct. It describes the specific phenomenon of having more than one embryo developing from a single seed, a characteristic of Citrus and Mango species. Option B refers to a different, rarer occurrence. C & D relate to other seed development patterns.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During secondary succession, which of the following ecological stages typically occurs *after* a volcanic eruption clears a barren landscape?
सही उत्तर: घ) D) Shrub stage – shrubs and small woody plants begin to colonize.
Option D is correct because the shrub stage represents a progression after initial colonization (lichen) with increased biomass and competition for resources. Lichen represent the first stage, followed by herbaceous then forest stages. Options A & B describe primary succession.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of secondary growth in woody plants, characterized by the lateral addition of vascular and cork tissues, is primarily driven by: (a) Cell division within the cambium. (b) Differentiation of xylem cells. (c) Activity of the apical meristems. (d) Accumulation of starch in storage organs.
सही उत्तर: ख) (b) Differentiation of xylem cells.
Secondary growth depends on the activity of the vascular cambium, a layer of meristematic cells that divides to produce new xylem and phloem. Option (b) describes primary xylem development; (c) refers to apical meristems’ role in primary growth, and (d) concerns carbohydrate storage. The cambium is responsible for secondary growth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of palisade cells in a leaf? (a) They provide structural support to the leaf. (b) They are responsible for gaseous exchange. (c) They carry out photosynthesis. (d) They absorb water from the soil.
सही उत्तर: ग) (c) They carry out photosynthesis.
Palisade cells are tightly packed and arranged perpendicularly to the leaf surface – this maximizes light absorption for photosynthesis. Option (a) describes collenchyma; (b) refers to mesophyll cells’ role in gas exchange; and (d) relates to root cell function. The correct answer aligns with their primary photosynthetic responsibility.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of starch grains within the cells of a plant’s root nodules primarily indicates: (a) Increased nitrogen uptake (b) Enhanced oxygen diffusion (c) A symbiotic relationship with nitrogen-fixing bacteria (d) Increased water absorption
सही उत्तर: ग) (c) A symbiotic relationship with nitrogen-fixing bacteria
Root nodules of leguminous plants house nitrogen-fixing bacteria. These bacteria convert atmospheric nitrogen into ammonia, a usable form for the plant. Starch is a product of photosynthesis and accumulates in cells involved in carbohydrate storage, reflecting the plant’s reliance on these bacterial partners for nutrition. Option (a) reflects simple nitrogen uptake; (b) concerns oxygen diffusion; and (d) refers to water absorption.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes photoperiodism? (a) It is a response to changes in temperature. (b) It is a response to changes in light intensity. (c) It is a response to changes in day length. (d) It is a response to changes in soil moisture.
सही उत्तर: ग) (c) It is a response to changes in day length.
Photoperiodism is the physiological reaction of plants to the relative lengths of night and day. Option (a) refers to thermoperiodism; (b) describes light intensity sensitivity, and (d) relates to soil moisture stress. Option (c) accurately defines photoperiodism based on day length as a key environmental cue for plant development.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process by which water moves through a plant from areas of high concentration to low concentration is called: (a) Translocation (b) Osmosis (c) Capillary action (d) Diffusion
सही उत्तर: ख) (b) Osmosis
Osmosis is the movement of water across a semi-permeable membrane from an area of high water potential (high concentration) to an area of low water potential (low concentration). Option (a) describes translocation of nutrients, (c) capillary action involves liquid movement in narrow tubes and (d) diffusion is the movement of molecules from an area of higher concentration to lower. This aligns with standard botanical definitions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the greenhouse gases, the one that contributes the largest share to the enhanced greenhouse effect is:
सही उत्तर: क) carbon dioxide
Carbon dioxide contributes about 60% of the total effect, followed by methane, CFCs and nitrous oxide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The national flower of Nepal is:
सही उत्तर: ख) Rhododendron arboreum (red rhododendron)
Lali gurans, the red rhododendron (Rhododendron arboreum, family Ericaceae), is the national flower of Nepal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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