कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. Entrance · Agriculture, Veterinary & Forestry Entrance
२,४६४ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान 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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The system of binomial nomenclature was introduced by:
सही उत्तर: ग) Carolus Linnaeus
Linnaeus gave each organism a two-part name (genus + species), e.g. Oryza sativa. Robert Hooke is known for first describing cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The five-kingdom classification was proposed by:
सही उत्तर: घ) R.H. Whittaker
Whittaker (1969) proposed Monera, Protista, Fungi, Plantae and Animalia. Carl Woese proposed the three-domain system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first land plants to possess vascular tissue were the:
सही उत्तर: घ) Pteridophytes
Pteridophytes (ferns and allies) were the first plants with xylem and phloem. Bryophytes lack vascular tissue, and gymnosperms evolved later.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bryophytes are called 'amphibians of the plant kingdom' because they:
सही उत्तर: घ) Need water for fertilization though they live on land
Mosses and liverworts grow on land, but their sperms swim through water to reach the egg. They lack true vascular tissue, which first appears in pteridophytes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gymnosperms are called 'naked-seeded' plants because they:
सही उत्तर: क) Lack an ovary enclosing the ovules
In gymnosperms like Pinus the ovules lie exposed on scales, so seeds are not enclosed in a fruit. Their seeds still have seed coats and cotyledons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Development of fruit without fertilization is called:
सही उत्तर: ग) Parthenocarpy
Parthenocarpy produces seedless fruits, as in banana, and can be induced with auxins or gibberellins. Parthenogenesis is development of an egg into an embryo without fertilization.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pollination by wind is called:
सही उत्तर: ख) Anemophily
Wind-pollinated flowers such as maize and grasses produce light, abundant pollen. Entomophily is pollination by insects.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The endosperm of angiosperms is:
सही उत्तर: क) Triploid (3n)
Endosperm forms when one male gamete fuses with the diploid secondary nucleus (triple fusion), giving 3n tissue. The zygote formed by syngamy is diploid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which material is commonly used in the laboratory to study stages of mitosis?
सही उत्तर: घ) Onion root tip
Onion root tips have actively dividing meristematic cells, ideal for observing mitosis. Pollen mother cells (anthers) are used to study meiosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Meiosis (both meiotic divisions together) in one diploid cell produces:
सही उत्तर: घ) Four haploid cells
Meiosis has two successive divisions and one DNA replication, giving four haploid cells. Mitosis gives two diploid cells identical to the parent.
💬 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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