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 primary function of stomata in plant leaves is: (a) Absorption of water from the soil (b) Exchange of gases (carbon dioxide and oxygen) (c) Translocation of sugars throughout the plant (d) Photosynthesis only occurring at night
सही उत्तर: ख) (b) Exchange of gases (carbon dioxide and oxygen)
Option (b) is correct as stomata are crucial for regulating gas exchange – taking in carbon dioxide for photosynthesis and releasing oxygen. The other options describe different processes like water uptake via roots, sugar transport within the plant's vascular system, or a single-process function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of lenticels in woody stems is: (a) Photosynthesis (b) Water absorption (c) Gas exchange (d) Nutrient transport
सही उत्तर: ग) (c) Gas exchange
Lenticels are small pores in the bark of woody stems that facilitate gas exchange (oxygen uptake for respiration and carbon dioxide release) between the internal tissues and the atmosphere. They do not perform photosynthesis, absorb water, or transport nutrients.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of 'geitonogamy' involves: (a) Pollination between flowers on different plants. (b) Self-pollination within a single flower. (c) Cross-pollination between flowers on the same plant. (d) Pollination by wind or insects.
सही उत्तर: घ) (d) Pollination by wind or insects.
Geitonogamy specifically refers to pollination between flowers of the same plant, even if they are not directly connected. This contrasts with cross-pollination (different plants) and self-pollination (within a flower).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of stomata in plant physiology? (a) They primarily facilitate the absorption of nutrients from the soil. (b) They regulate gas exchange (CO2 intake and O2 release) and transpiration. (c) They are involved in water storage within the leaf tissue. (d) They exclusively contribute to photosynthesis by converting light energy into chemical energy.
सही उत्तर: ख) (b) They regulate gas exchange (CO2 intake and O2 release) and transpiration.
Stomata play a crucial role in regulating gas exchange, allowing CO2 uptake for photosynthesis and O2 release. This also facilitates transpiration – water loss from the plant. The other options describe incorrect functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The edible part of mango is the: a) Seed. b) Mesocarp. c) Endocarp. d) Epicuticle.
सही उत्तर: ग) c) Endocarp.
The edible part of a mango (C) is the fleshy endocarp that surrounds and protects the seed. The mesocarp is the outer layer, and the seed itself is inedible. Options A & D are incorrect terms describing different parts of the fruit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Glycolysis takes place in the: a) Mitochondria. b) Golgi apparatus. c) Cytoplasm. d) Nucleus.
सही उत्तर: ग) c) Cytoplasm.
Glycolysis (C) is the process of glucose breakdown that occurs in the cytoplasm of cells. Options A & B describe locations where oxidative phosphorylation takes place; option D incorrectly places this process within the nucleus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A plant cell placed in pure water becomes fully turgid. At this stage: a) The cytoplasm shrinks. b) The vacuole contracts. c) The osmotic pressure is at its maximum. d) The starch granules disappear.
सही उत्तर: ग) c) The osmotic pressure is at its maximum.
The correct answer (C) is accurate because turgidity in plant cells results from the influx of water due to osmosis, increasing the osmotic pressure within the cell. Option A is incorrect as turgor pressure actually *increases* cell volume and rigidity. Option B is false because it describes the opposite process. Option D is irrelevant to the state of turgidity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of mycorrhizae in plant nutrition?
सही उत्तर: ख) B) They enhance water absorption from the soil by increasing the root's surface area.
Mycorrhizae are symbiotic associations between fungi and plant roots. The fungal hyphae extend far into the soil, dramatically increasing the root’s surface area and thus significantly improving water and nutrient uptake (particularly phosphorus) for the plant – primarily by expanding access to resources. Option A is a common misconception about nitrogen fixation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term ‘phyllotaxy’ refers to the arrangement of leaves on a stem. What does alternate phyllotaxy mean?
सही उत्तर: ग) C) Leaves arranged one at a time along the stem, with no overlapping.
Alternate phyllotaxy describes leaf arrangement where each leaf is attached to the stem at different points, appearing in an alternating pattern - one leaf between nodes. Option A is incorrect as it describes spiral patterns and option D incorrectly describes a clustered arrangement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which adaptation enables certain plants, like Opuntia, to maximize photosynthetic surface area?
सही उत्तर: ख) B) Development of a flattened, segmented stem covered in spines for sunlight exposure.
Opuntia's characteristic flattened green stems (cladodes), covered in spines, act as expanded photosynthetic surfaces, significantly increasing light capture. This is a key adaptation for maximizing photosynthesis. Option A describes a different leaf shape. Options C and D are related to other plant adaptations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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