कृषि, पशु र वन विज्ञान B.Sc. Forestry प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Forestry प्रवेश
B.Sc. Forestry Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ 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
-
Gymnosperms are said to have 'naked seeds' because:
सही उत्तर: क) Their ovules are not enclosed in an ovary
In gymnosperms the ovules lie exposed on megasporophylls before and after fertilisation; there is no ovary wall, so no fruit forms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Algin (alginic acid), a hydrocolloid used in industry, is obtained from:
सही उत्तर: घ) Brown algae
Algin is extracted from the cell walls of brown algae (Phaeophyceae) such as kelps; red algae yield agar and carrageenan.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The red colour of red algae (Rhodophyceae) is due to the pigment:
सही उत्तर: क) Phycoerythrin
Red algae contain the red pigment r-phycoerythrin, which absorbs blue-green light and lets them photosynthesise at great depths.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Agar, used in culture media and ice creams, is commercially obtained from red algae such as:
सही उत्तर: घ) Gelidium
Agar is extracted from red algae like Gelidium and Gracilaria; Laminaria is a brown alga.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The ability of a single plant cell to regenerate into a complete plant is called:
सही उत्तर: क) Totipotency
Totipotency of plant cells is the basis of plant tissue culture and micropropagation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The antibiotic penicillin was first obtained from the fungus:
सही उत्तर: क) Penicillium notatum
Alexander Fleming discovered in 1928 that the mould Penicillium notatum inhibits growth of Staphylococcus; streptomycin comes from Streptomyces griseus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Diatomaceous earth is formed from the cell walls of diatoms, which are made mainly of:
सही उत्तर: ख) Silica
Diatom walls (frustules) are impregnated with silica, so they do not decay and accumulate as diatomaceous earth used in polishing and filtration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The infective stage of Plasmodium that enters human blood through the bite of a female Anopheles mosquito is the:
सही उत्तर: ग) Sporozoite
Sporozoites from the mosquito's salivary glands are injected into human blood and first multiply in liver cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Methanogens, which produce methane in the rumen of cattle and in biogas plants, belong to:
सही उत्तर: ख) Archaebacteria
Methanogens are archaebacteria living in anaerobic environments; they produce methane from CO2 and H2 or acetate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In Nostoc and Anabaena, nitrogen fixation takes place in specialised thick-walled cells called:
सही उत्तर: क) Heterocysts
Heterocysts lack oxygen-evolving photosystem II, giving the oxygen-sensitive nitrogenase a suitable environment for fixing nitrogen.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।