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 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)
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In grass leaves, the large, empty, colourless epidermal cells that make the leaf roll inward when they lose water are called:
सही उत्तर: ग) bulliform cells
Bulliform cells on the upper epidermis of grass leaves become flaccid under water stress, causing the leaf to curl and reduce water loss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In grasses, regrowth of the stem after the upper parts are grazed by animals is mainly due to the activity of the:
सही उत्तर: क) intercalary meristem
Intercalary meristems at the bases of internodes in grasses keep dividing, so grazed grasses grow again.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a maize grain, the protein-rich layer that separates the endosperm from the embryo and lies just below the seed coat is the:
सही उत्तर: ग) aleurone layer
The aleurone layer, a proteinaceous outer layer of the endosperm, secretes enzymes during germination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In which of the following seeds is the endosperm completely used up by the developing embryo, making the mature seed non-endospermic?
सही उत्तर: ग) Pea
In pea, gram and groundnut the cotyledons absorb the endosperm; maize, wheat and castor retain endosperm in the mature seed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Tulip, Gloriosa, Aloe and Asparagus belong to the family:
सही उत्तर: घ) Liliaceae
These are monocots of the lily family (Liliaceae), with trimerous flowers, a perianth of tepals and a superior trilocular ovary.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the flowers of the family Fabaceae (pea family), the ten stamens are usually:
सही उत्तर: ख) diadelphous, arranged as (9) + 1
Nine filaments are fused into a sheath and one posterior stamen is free, so the androecium is diadelphous.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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