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
-
Alternation of an asexual polyp form with a sexual medusa form (metagenesis) is seen in:
सही उत्तर: क) Obelia
In Obelia the polyp produces medusae asexually and the medusae reproduce sexually to form polyps, showing metagenesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The rasping, file-like feeding organ found in the mouth of most molluscs is the:
सही उत्तर: ख) Radula
The radula is a chitinous ribbon with rows of teeth used for scraping food, characteristic of molluscs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In flatworms such as Planaria and liver fluke, osmoregulation and excretion are carried out by:
सही उत्तर: घ) Flame cells
Platyhelminthes have protonephridia with specialised flame cells for osmoregulation and excretion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A water vascular system with tube feet used for locomotion and food capture is a characteristic feature of:
सही उत्तर: ग) Echinodermata
Echinoderms such as starfish possess a water vascular system that operates tube feet; it is unique to this phylum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Cnidoblasts (cnidocytes), used for anchorage, defence and capture of prey, are found in:
सही उत्तर: ख) Hydra and other coelenterates
Cnidoblasts containing nematocysts (stinging capsules) are the distinctive cells of phylum Cnidaria (Coelenterata) such as Hydra.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Choanocytes (collar cells) that line the spongocoel and canals are characteristic of phylum:
सही उत्तर: क) Porifera
Choanocytes with a flagellum and collar create water current and trap food; they are unique to sponges (Porifera).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
An interaction in which one species benefits and the other is neither harmed nor benefited is called:
सही उत्तर: ग) Commensalism
In commensalism one partner gains (e.g. an orchid growing on a mango branch) while the other is unaffected.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Immunity obtained by injecting ready-made antibodies, such as anti-tetanus serum, is called:
सही उत्तर: घ) Passive immunity
When preformed antibodies are given directly, protection is quick but short-lived; this is passive immunity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In the human testis, testosterone is secreted by the:
सही उत्तर: क) Leydig (interstitial) cells
Leydig cells in the spaces between seminiferous tubules secrete androgens such as testosterone; Sertoli cells nourish developing sperms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Glucagon is secreted by which cells of the islets of Langerhans?
सही उत्तर: ख) Alpha cells
Alpha cells secrete glucagon, which raises blood glucose; beta cells secrete insulin and delta cells somatostatin.
💬 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।