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 chloroplasts of Spirogyra are:
सही उत्तर: घ) ribbon-shaped and spirally arranged
Spirogyra has one or more ribbon-shaped chloroplasts arranged spirally, with many pyrenoids; Chlamydomonas has a cup-shaped chloroplast.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fusion of a large, non-motile female gamete with a smaller, motile male gamete (oogamy) occurs in:
सही उत्तर: क) Volvox and Fucus
Volvox (green alga) and Fucus (brown alga) are oogamous; many Chlamydomonas species and Ulothrix are isogamous and Spirogyra reproduces by conjugation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A meiocyte of rice has 24 chromosomes. The number of chromosomes in each nucleus of its pollen grain is:
सही उत्तर: ग) 12
Meiocytes are diploid (2n = 24); meiosis halves the number, so the haploid pollen has n = 12.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The root-tip cells of onion have 16 chromosomes. The number of chromosomes in its endosperm cells is:
सही उत्तर: क) 24
Root-tip cells are diploid (2n = 16), so n = 8; the triploid endosperm has 3n = 24 chromosomes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Leucoplasts that store oils and fats are called:
सही उत्तर: घ) elaioplasts
Elaioplasts store oils and fats, amyloplasts store starch and aleuroplasts store proteins.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The red colour of ripe tomatoes and the orange colour of carrots are due to pigments present in:
सही उत्तर: ख) chromoplasts
Chromoplasts contain fat-soluble carotenoid pigments such as lycopene and carotene, which give yellow, orange or red colours.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hardness and rigidity of the secondary cell wall of xylem vessels and fibres is mainly due to deposition of:
सही उत्तर: ख) lignin
Lignin deposited in the secondary wall makes xylem elements and fibres hard, rigid and water-resistant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Polyembryony is commonly seen in:
सही उत्तर: ग) Citrus
In Citrus, nucellar cells develop into additional embryos, so a seed contains more than one embryo. Pea, wheat and mustard usually have a single embryo per seed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Perisperm is:
सही उत्तर: क) Persistent nucellus in the seed
In seeds like black pepper and beet, part of the nucellus persists and is called perisperm. Endosperm, by contrast, develops from the primary endosperm nucleus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The formation of seeds without fertilisation is called:
सही उत्तर: क) Apomixis
Apomixis produces seeds without fertilisation, as in some grasses and Asteraceae. Parthenocarpy produces seedless fruits without fertilisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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