Which of the following statement is correct about Bt toxin ?

detailed solution

Correct option is D

The inactive protoxin gets converted into active form in the insect gut due to the alkaline pH of the gut which solubilises the crystals.Bt toxin in present in the inactive form in Bacillus.The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.Bacillus does not have antitoxins but toxin is inactive. The toxin becomes active only when it reaches the gut of the insect.