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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Which reptile has a completely four-chambered heart?
सही उत्तर: ख) Crocodile
Most reptiles have an incompletely divided ventricle, but crocodiles have a complete septum and hence four chambers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In insects such as the cockroach, nitrogenous wastes are removed mainly by:
सही उत्तर: घ) Malpighian tubules
Malpighian tubules, opening at the junction of the midgut and hindgut, absorb wastes from haemolymph in insects.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lampreys and hagfishes, which have a sucking circular mouth without jaws, belong to the class:
सही उत्तर: क) Cyclostomata
Cyclostomes are jawless vertebrates (Agnatha) with a circular suctorial mouth and no paired fins.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Marine animals that move with eight rows of ciliated comb plates and show bioluminescence belong to phylum:
सही उत्तर: घ) Ctenophora
Ctenophores (comb jellies) such as Pleurobrachia swim using eight external rows of ciliated comb plates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The inflorescence of sunflower, with many sessile florets on a flattened receptacle, is a:
सही उत्तर: घ) Capitulum (head)
Sunflower has a capitulum, with ray florets at the margin and disc florets in the centre on a flat receptacle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the embryo of a grass such as maize, the single shield-shaped cotyledon is called the:
सही उत्तर: ख) Scutellum
The scutellum is the cotyledon of monocot grasses; the coleoptile and coleorhiza are sheaths over the plumule and radicle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The persistent nutritive remnant of the nucellus found in some seeds, such as black pepper and beet, is called the:
सही उत्तर: ग) Perisperm
Usually the nucellus is used up, but when part of it persists in the seed it is called perisperm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fruit of mustard, which splits from below upwards along two sutures leaving a false septum (replum), is a:
सही उत्तर: ख) Siliqua
Mustard (Brassicaceae) has a siliqua, a long two-chambered fruit with a replum; a legume opens along both sutures without a replum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In wheat and rice, the fruit wall (pericarp) is fused with the seed coat. Such a one-seeded fruit is called a:
सही उत्तर: ख) Caryopsis
The caryopsis (grain) of cereals has the pericarp fused with the testa, so the 'seed' is actually a fruit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Apple is called a false fruit because its fleshy edible part develops from the:
सही उत्तर: क) Thalamus
In a pome such as apple, the fleshy part grows from the thalamus (receptacle), not from the ovary.
💬 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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