Question

Bt toxin produced by Bacillus thuringiensis does not kill the producer because the toxin is. 

(A) in an inactive protoxin form 

(B) rapidly secreted outside 

(C) inactivated by an antitoxin 

(D) in unfolded form  

Answer 1

Correct option (A) in an inactive protoxin form 

Explanation:

Bt toxin is in inactive form in cotton but as the insect engulf the bud (recombinated) the cry gene mediated toxin activated in the alkaline pH (9.5), frequently such conditions are present inside insects gut so the insect die but not the producer (plant).