In Bt cotton,the Bt toxin present in plant ti | vedclass

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(C) The correct answer is $C$. Soil bacterium $Bacillus$ $thuringiensis$ produces proteins that kill certain insects like lepidopterans (tobacco budwo

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alkaline $pH$ of the insect gut

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(C) The correct answer is $C$. Soil bacterium $Bacillus$ $thuringiensis$ produces proteins that kill certain insects like lepidopterans (tobacco budworm,armyworm),coleopterans (beetles),and dipterans (flies,mosquitoes). $B. thuringiensis$ forms protein crystals containing a toxic insecticidal protein. This toxin does not kill the bacterium because it exists as an inactive protoxin. Once an insect ingests the plant tissue,the protoxin is converted into an active form of toxin due to the alkaline $pH$ of the insect's alimentary canal. The activated toxin binds to the surface of midgut epithelial cells and creates pores,which cause swelling and lysis,eventually leading to the death of the insect.

In $Bt$ cotton,the $Bt$ toxin present in plant tissue as protoxin is converted into active toxin due to

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