where will I get nucleopolyhedrovirus in Biology chapter

Solution:

Nucleopolyhedovirus is a virus that attacks insects especially moths and butterflies and they are excellent candidates for species-specific, narrow spectrum insecticidal applications. It consists of a polyhedral capsid, an extremely stable protein crystal. This protects the virus in the external environment. This protein crystal is capable of dissolving in the midgut of larva. Being alkaline in nature, the midgut provides a congenial environment for the release of the virus particle that ultimately infects the larva.

You will find about Nucleopolyhedovirus in the chapter 'Microbes in human welfare' in class XII. 
 

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