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 occurrence of more than one embryo in a seed, common in Citrus and mango, is called:
सही उत्तर: क) polyembryony
In Citrus and mango some nucellar cells develop into extra embryos, so one seed contains several embryos.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Maize is pollinated mainly by wind. The large, feathery stigmas of its 'silk' help to:
सही उत्तर: ग) trap pollen grains carried by the air
Wind-pollinated flowers produce light, non-sticky pollen in large amounts and have large feathery stigmas to catch airborne pollen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flowers that never open, so that only self-pollination is possible, are called cleistogamous. They are found in:
सही उत्तर: घ) Commelina, Viola and Oxalis
Cleistogamous flowers of Viola, Oxalis and Commelina remain closed; their anthers and stigma lie close, ensuring autogamy and assured seed set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In most flowering plants the embryo sac develops from a single functional megaspore. This type of development is called:
सही उत्तर: ग) monosporic (Polygonum type)
Of the four megaspores formed by meiosis, three degenerate and only one develops into the 7-celled, 8-nucleate embryo sac.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In rice and wheat, pollen grains lose their viability within about:
सही उत्तर: घ) 30 minutes of release
Pollen of rice and wheat stays viable for only about 30 minutes, whereas pollen of some members of Rosaceae, Leguminosae and Solanaceae remains viable for months.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hard outer layer (exine) of the pollen grain is made of:
सही उत्तर: ग) sporopollenin
Sporopollenin is one of the most resistant organic materials known; it withstands high temperature, strong acids and alkalis, which is why pollen fossils survive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The innermost wall layer of the microsporangium (anther), which nourishes the developing pollen grains, is the:
सही उत्तर: घ) tapetum
Tapetal cells have dense cytoplasm and often more than one nucleus; they nourish the developing microspores.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The instrument used to measure the rate of growth in length of a plant stem is the:
सही उत्तर: घ) auxanometer
An arc auxanometer magnifies the small increase in stem length so it can be measured; a potometer measures water uptake (transpiration).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the brewing industry, gibberellins are applied to barley grains to:
सही उत्तर: घ) speed up the malting process
Gibberellins stimulate the aleurone layer to make α-amylase, speeding up starch breakdown during malting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a long-day plant that flowers when the daily light period exceeds a critical length?
सही उत्तर: ग) Wheat
Wheat, radish and spinach are long-day plants; Xanthium, soybean and chrysanthemum are short-day plants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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