Q.10
ICAR 2023Shift 1 Statement Based +4 −1
English हिन्दी

Given below are two statements

Statement (I) : Propagative viruses cannot multiply in their respective vectors.
Statement (II) : Non persistent viruses are generally stylet borne.

In light of the above statements, choose the most appropriate answer from the options given below:

नीचे दो कथन दिए गए हैं

कथन (I) : प्रोपेगेटिव विषाणु (Propagative viruses) अपने संबंधित वाहकों के शरीर में गुणन (गुणा) नहीं कर सकते।
कथन (II) : गैर-स्थायी विषाणु (Non-persistent viruses) सामान्यतः स्टाइलेट-जनित (Stylet-borne) होते हैं।

उपरोक्त कथनों के आलोक में, नीचे दिए गए विकल्पों में से सबसे उपयुक्त उत्तर चुनें:

EXPLANATION Pests of Cereals, Millets and Pulses: Rice, Wheat, Maize, Sorghum, Gram, Pigeonpea

Virus transmission mechanisms in entomology:

  • Statement (I) is incorrect: By definition, propagative viruses are those that actively infect and multiply / replicate within the tissues, hemolymph, and salivary glands of their insect vectors (e.g. Potato yellow dwarf virus, Tomato spotted wilt virus in thrips, Rice ragged stunt virus in planthoppers).
  • Statement (II) is correct: Non-persistent viruses (e.g. Cucumber mosaic virus, Potato virus Y) are acquired and inoculated within seconds to minutes without a latent period because they adhere specifically to the cuticular lining of the insect mouthparts (stylet-borne).
Hence, Statement (I) is incorrect but Statement (II) is correct.

कीटों द्वारा विषाणु संचरण की क्रियाविधि:

  • कथन (I) गलत है: परिभाषा के अनुसार, प्रोपेगेटिव विषाणु (Propagative viruses) वे होते हैं जो अपने कीट वाहक के ऊतकों व कोशिकाओं के भीतर सक्रिय रूप से गुणन (Replicate) करते हैं।
  • कथन (II) सही है: गैर-स्थायी विषाणु (Non-persistent viruses) कीट की चुभने-चूसने वाली मुखांग सुई (Stylet) की क्यूटिकल पर चिपक कर संचरित होते हैं, इसलिए इन्हें स्टाइलेट-जनित (Stylet-borne) कहा जाता है।
अतः कथन (I) गलत है लेकिन कथन (II) सही है।
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