Bt toxin kills the insect by
blocking mitochondrial respiration
blocking transfer of nerve impulse
creating pores in body surface
creating pores in mid-gut epithelial cell
The correct option is D creating pores in mid-gut epithelial cell
After ingestion by the insect, the protoxin is converted/cleaved into shorter versions of the protein that display the toxic activity. These bind to the mid gut epithelium and create pores that cause cell swelling and lysis. The insect is unable to feed and consequently starves to death.