NEET 2025 Biology question
Given below are two statements : Statement I : Bt toxins are insect group specific and coded by a gene *cry* IAc. Statement II : Bt toxin exists as inactive protoxin in *B. thuringiensis*. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. In the light of the above statements, choose the correct answer from the options given below :
Answer: (D)
Solution
Bt protoxin is activated by the alkaline pH of the insect gut, so Statement II is false.