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 ‘Crassulacean Acid Metabolism’ (CAM) photosynthesis is commonly found in plants adapted to: (a) Cool, moist environments. (b) Hot, arid environments. (c) Shaded forest floors. (d) Nutrient-rich aquatic habitats.
सही उत्तर: ग) (c) Shaded forest floors
CAM photosynthesis is a specialized adaptation to conserve water in dry conditions. Plants exhibiting this pathway open their stomata at night to take up carbon dioxide, reducing water loss during the day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the function of xylem tissue in plants? (a) Transporting sugars from source to sink. (b) Facilitating gas exchange between the plant and its environment. (c) Conducting water and minerals from roots to other parts of the plant. (d) Providing structural support to the plant stem.
सही उत्तर: ग) (c) Conducting water and minerals from roots to other parts of the plant.
Xylem is specifically designed for the transport of water and mineral salts upwards through the plant. The other options describe functions of phloem (sugar transport), stomata (gas exchange), and collenchyma/sclerenchyma respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination where pollen grains are carried by wind to different flowers is called: (a) Geotropism (b) Pollination (c) Anemophily (d) Hydrophily
सही उत्तर: ग) (c) Anemophily
Anemophily specifically refers to pollination by wind. The other options represent different pollination mechanisms (geotropism – growth in response to gravity, hydrophily - water pollination, and pollination is the general term for transferring pollen).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the context of leaf anatomy, what is the primary function of ‘bulliform cells’ found in grass leaves?
सही उत्तर: ग) They are specialized for gas exchange through stomata
Bulliform cells are large, inflated cells at the leaf margins of grasses. Their primary function is to create a stiff, expanded leaf surface that allows the grass blades to stand upright, maximizing sunlight capture for photosynthesis. The other options describe different cell types and their respective functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of which micronutrient is essential for the synthesis of the plant hormone auxin?
सही उत्तर: ख) Magnesium (Mg)
Auxin biosynthesis requires iron. Iron plays a vital role in several enzymatic reactions involved in auxin production within plant cells. Magnesium and manganese are essential for chlorophyll synthesis but not directly for auxin pathways. Zinc is important for other developmental processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the characteristic difference between heartwood and sapwood in a tree?
सही उत्तर: ग) Heartwood is inactive and non-functional, while sapwood provides transport functions
Heartwood, formed by the older xylem tissues, becomes dense and dark because of resin deposition and lignin accumulation. It primarily provides structural support. Sapwood, composed of younger xylem, is lighter in color and actively involved in transporting water and nutrients. The other options describe incorrect characteristics.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon observed when the stem of a well-watered herbaceous plant is cut near the base in the morning, resulting in sap oozing out is known as:
सही उत्तर: घ) Root pressure
This phenomenon is termed ‘guttation’. It occurs due to the build-up of water potential gradients in the xylem vessels caused by transpiration. The cohesive and adhesive properties of water allow it to flow out through specialized structures at the leaf's base. Transpiration pull and capillary action explain movement within the vascular system, while root pressure involves upward movement from roots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following vascular bundles found in dicot stems typically contains phloem only on the abaxial side? (A) Cambium. (B) Protoxylem. (C) Xylem. (D) Metaxylem.
सही उत्तर: घ) Metaxylem.
During secondary growth, the xylem cells (protoxylem) generally remain in the center of the stem, while phloem develops on the periphery. The metaxylem continues to develop and carries water; the cambium produces new xylem and phloem – (C) is correct. The other options relate to different vascular bundles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of CAM plants in water conservation? (A) They open their stomata fully throughout the day to maximize carbon dioxide uptake. (B) They carry out photosynthesis during the day and fix carbon dioxide at night. (C) They rely solely on diffusion for nutrient absorption from the soil. (D) They have reduced leaf surface area to minimize water loss.
सही उत्तर: ख) They carry out photosynthesis during the day and fix carbon dioxide at night.
CAM plants (Crassulaceae) temporally separate carbon fixation and the Calvin cycle by opening their stomata primarily at night, reducing water loss during the day – (B) is correct. The other options describe incorrect strategies for water conservation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘sink strength’ in plants refers to: (A) The ability of a plant to resist environmental stresses like drought. (B) The capacity of a plant part to attract and utilize resources from other parts of the plant. (C) The resistance of a plant stem to bending under physical pressure. (D) The speed at which a seed germinates upon receiving water.
सही उत्तर: ख) The capacity of a plant part to attract and utilize resources from other parts of the plant.
Sink strength describes the ability of a specific plant organ (e.g., fruit or leaf) to attract and channel resources like sugars produced during photosynthesis – (B) is correct. The other options describe different aspects of plant physiology.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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