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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Mature sieve tube elements of angiosperms lack:
सही उत्तर: ख) A nucleus
Sieve tube elements lose their nucleus at maturity, and their functions are controlled by companion cells. They retain a peripheral cytoplasm and have sieve plates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The only living component of xylem is:
सही उत्तर: घ) Xylem parenchyma
Xylem parenchyma cells are living and store food. Tracheids, vessels and xylem fibres are dead at maturity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Collenchyma differs from sclerenchyma in having:
सही उत्तर: क) Living cells thickened at corners with cellulose and pectin
Collenchyma is a living tissue with cellulose, hemicellulose and pectin thickenings, usually at corners. Sclerenchyma cells are dead with heavily lignified walls.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phellogen is another name for:
सही उत्तर: क) Cork cambium
Phellogen (cork cambium) produces phellem (cork) outside and phelloderm inside. Together these three form the periderm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lenticels in woody stems are mainly concerned with:
सही उत्तर: ख) Gaseous exchange
Lenticels are lens-shaped openings in the bark formed by cork cambium that allow gaseous exchange. Most transpiration occurs through stomata, not lenticels.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heartwood differs from sapwood in that heartwood is:
सही उत्तर: ख) Dark and does not conduct water
Heartwood is the central, dark wood filled with tannins, resins and gums; it no longer conducts water. Sapwood is the outer, lighter, functional wood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Annual rings in a tree trunk are formed due to the activity of:
सही उत्तर: घ) Vascular cambium
Vascular cambium produces wider spring wood and narrower autumn wood each year, forming a ring. Cork cambium forms the periderm, not wood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bulliform cells in grass leaves help in:
सही उत्तर: ग) Rolling of leaves to reduce water loss
Bulliform cells are large, empty epidermal cells that lose turgor in water stress, making the leaf roll. Gaseous exchange occurs through stomata.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Casparian strips are found in the:
सही उत्तर: क) Endodermis
Endodermal cells have suberin-rich Casparian strips that block the apoplastic movement of water. The pericycle lies just inside the endodermis and gives rise to lateral roots.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vascular bundles in a monocot stem are:
सही उत्तर: क) Scattered and closed
Monocot stems have scattered vascular bundles without cambium (closed). Dicot stems have bundles in a ring with cambium (open).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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