चिकित्सा शिक्षा आयोग (CEE) एमबीबीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – एमबीबीएस प्रवेश परीक्षा
CEE – MBBS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing प्रवेश: 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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A plant cell placed in pure water becomes fully turgid. At this stage:
सही उत्तर: ख) its water potential is zero, as ψp equals −ψs
Water enters until ψw of the cell equals that of pure water (zero); then ψp = −ψs, so ψw = ψs + ψp = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Dry seeds and raisins swell up when placed in water. This phenomenon is called:
सही उत्तर: घ) imbibition
Imbibition is the absorption of water by hydrophilic colloids such as cellulose, starch and proteins, causing swelling.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water potential (ψw) of a plant cell is related to its solute potential (ψs) and pressure potential (ψp) by:
सही उत्तर: ख) ψw = ψs + ψp
Water potential is the sum of solute potential (always negative) and pressure potential (usually positive in a turgid cell).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the dorsiventral leaf of a typical dicot, stomata are usually:
सही उत्तर: ग) more numerous on the lower (abaxial) surface
Dicot leaves usually have more stomata on the lower surface, which reduces water loss; isobilateral monocot leaves have them on both surfaces.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In roots, most water and minerals are absorbed through the root hairs, which are outgrowths of the:
सही उत्तर: क) epidermal cells
Root hairs are unicellular tubular extensions of epidermal cells in the zone of maturation, greatly increasing the absorbing surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phloem parenchyma is absent in the phloem of:
सही उत्तर: क) most monocotyledons
Phloem parenchyma is present in most dicots, gymnosperms and pteridophytes, but is absent in most monocots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The periderm formed during secondary growth consists of:
सही उत्तर: ख) phellem, phellogen and phelloderm
Phellogen (cork cambium) produces cork (phellem) outward and secondary cortex (phelloderm) inward; together these three form the periderm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gritty texture of the pulp of pear and guava is due to the presence of:
सही उत्तर: ख) sclereids (stone cells)
Sclereids are short, dead sclerenchyma cells with very thick lignified walls and narrow lumens, found in the fruit walls of pear, guava and nuts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Collenchyma, which gives mechanical support to young stems and petioles, has cell walls thickened at the corners with:
सही उत्तर: ग) cellulose, hemicellulose and pectin
Collenchyma cells are living, with walls unevenly thickened at the corners by cellulose, hemicellulose and pectin; sclerenchyma walls are lignified.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which feature is typical of a monocot stem in transverse section?
सही उत्तर: घ) Many vascular bundles scattered in the ground tissue
Monocot stems have numerous scattered, closed vascular bundles surrounded by sclerenchymatous sheaths and no cambium; radial bundles occur in roots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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