जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: 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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Casparian strips, thickened with suberin, are found in the cells of the:
सही उत्तर: ख) Endodermis
Endodermal cells of the root have suberin bands (Casparian strips) on their radial and tangential walls that block apoplastic water movement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Peat, used as fuel and as packing material, is obtained from the moss:
सही उत्तर: घ) Sphagnum
Partly decomposed Sphagnum (peat moss) accumulates as peat; Sphagnum also holds water, so it is used for packing living material.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first terrestrial plants to possess vascular tissues (xylem and phloem) were the:
सही उत्तर: घ) Pteridophytes
Pteridophytes (ferns, horsetails, club mosses) are the first land plants with true vascular tissue, though they have no seeds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which group of plants is called the 'amphibians of the plant kingdom'?
सही उत्तर: ख) Bryophytes
Bryophytes live on land but need water for fertilisation, as their sperms swim to the egg, hence the name.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coralloid roots of Cycas are associated with:
सही उत्तर: ग) Nitrogen-fixing cyanobacteria
Coralloid roots of Cycas harbour nitrogen-fixing cyanobacteria such as Anabaena and Nostoc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In gymnosperms, the endosperm (female gametophyte tissue) is:
सही उत्तर: ख) Haploid
Gymnosperm endosperm is the female gametophyte formed before fertilisation from a haploid megaspore, so it is haploid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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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)
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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)
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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)
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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)
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