Why Bt toxin gene does not kill Bacillus bacteria in which it is found ?

Why is Bt toxin an endotoxin?

Assertion: Crystal protein does not kill the Bacillus & kill only insect Reason :In Bacillus it exist as inactive proteins but in insect it is converted into an active form due to acidic pH of the gut

Bt toxin kills insects by

Bt toxin genes are isolated from Bacillus thuringiensis and incorporated into crop plants making them insecticidal. The choice of genes depend upon

Assertion: Bt -toxines kills the Bacillus thuringiensis Reason :Bt-toxins exist as active toxins in Bacillus thuringiensis

Why does the Bt toxin not kill the bacterium that produces it but kills the insect that ingests it?

Consider the following statements. I. Specific Bt toxin genes have been isolated from Bacillus thuringiensis. II. Bt toxin in coded by a gene named cry III. Bt toxin protein exists as inactive protoxins. Which of the following statements given above are correct ?

Bt toxin kills the insect by