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 phenomenon of pollination, involving the transfer of pollen from stamen to pistil, relies heavily on: (a) Root pressure (b) Capillary action (c) Wind and biotic agents (e.g., insects, birds) (d) Gravitational force
सही उत्तर: घ) (d) Gravitational force
Pollination depends on the movement of pollen grains to reach the stigma of a flower for fertilization. While root pressure and capillary action are involved in water transport within plants, wind, insects, birds and other animals are key agents in pollen transfer. Gravitational force plays no direct role.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of chloroplasts in a plant cell? (a) Storage of genetic information (b) Site of protein synthesis (c) Location of photosynthesis (d) Regulation of water balance
सही उत्तर: ग) (c) Location of photosynthesis
Chloroplasts contain chlorophyll and are the organelles where photosynthesis – the conversion of light energy into chemical energy (glucose) – takes place. Storage of genetic information is associated with the nucleus; protein synthesis occurs in ribosomes; and water balance is regulated by vacuoles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of xylem vessels in plants is: (a) Translocation of sugars produced during photosynthesis (b) Absorption of water and minerals from the soil (c) Release of oxygen into the atmosphere (d) Support and transport of water upwards through the plant
सही उत्तर: ख) (b) Absorption of water and minerals from the soil
Xylem vessels are specifically designed for the efficient transport of water and mineral ions absorbed by roots to other parts of the plant. The other options describe functions of phloem, stomata, or respiration respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following adaptations is MOST characteristic of plants adapted to xerophytic (dry) environments?
सही उत्तर: ख) B. Succulent stems and reduced leaf surface area to minimize water loss.
Xerophytes have evolved specific features to conserve water in arid environments. Succulent stems and reduced leaves are key adaptations that drastically reduce the surface area exposed to the sun and minimize evaporation. Option A is characteristic of plants in humid climates; option C relates to nutrient acquisition, and option D involves vascular tissue.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of osmosis plays a vital role in water transport within plant tissues. What primarily drives this movement?
सही उत्तर: ग) C. Differences in water potential between the soil and the plant roots.
Osmosis is driven by differences in water potential – essentially, the tendency of water to move from an area of high water potential (e.g., the soil) to an area of low water potential (e.g., inside plant roots). This movement maintains turgor pressure and facilitates nutrient uptake. Options A, C, and D represent other mechanisms involved but aren’t the primary driver.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following botanical terms correctly identifies the structure responsible for the production of male gametes in gymnosperms?
सही उत्तर: ग) C. Pollen Grain
The pollen grain contains the male gametes (sperm cells) necessary for fertilization in gymnosperms. The ovule holds the female gamete, a megaspore is a larger spore used in seed development and an embryo sac houses the female gametes in angiosperms. This is the core function of a pollen grain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of CAM photosynthesis in plants like pineapple is to:
सही उत्तर: ख) B. Minimize water loss by separating carbon dioxide uptake and sugar synthesis.
CAM (Crassulacean Acid Metabolism) photosynthesis is adapted to arid environments where water conservation is crucial. It achieves this by separating the processes of CO2 uptake and sugar synthesis, dramatically reducing water loss. Option A describes C3 photosynthesis; option C relates to chlorophyll, and option D represents a general growth mechanism.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What morphological adaptation is most characteristic of succulent plants (e.g., cacti) evolved to thrive in arid environments?
सही उत्तर: ख) Thick cuticles reducing water loss through transpiration.
Succulent plants have evolved a thick, fleshy epidermis and succulent stem tissue (parenchyma) to store large quantities of water. This adaptation allows them to tolerate prolonged periods without rainfall, as opposed to the other options which are relevant for different plant types or environmental conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of phototropism, where plants grow towards a light source, relies on the detection of light intensity. What cellular component is primarily responsible for this directional response?
सही उत्तर: ग) Phytochromes, photoreceptor proteins that detect blue light.
Phytochromes are a type of photoreceptor protein within plant cells. These pigments specifically absorb blue light, which triggers the phototropic response – the movement towards light. This is a fundamental mechanism for optimizing sunlight capture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination, where pollen grains are transferred from the anther to the stigma, is essential for plant reproduction. Which of the following mechanisms primarily contributes to wind-pollination in many plants?
सही उत्तर: ग) Small, inconspicuous flowers producing copious amounts of pollen.
Wind-pollinated plants typically produce vast quantities of lightweight, non-sticky pollen grains. This adaptation allows for dispersal over long distances by wind currents, as opposed to the mechanisms involved in insect or animal pollination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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