To solve this problem, we need to analyze the given statements:$\newline$Statement I: Bt toxins are insect group specific and coded by a gene cry IAc.$\newline$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.$\newline$Let's break down each statement:$\newline \bullet$Statement I:$\newline$ - Bt toxins are indeed specific to certain groups of insects.$\newline$ - The gene cry IAc is one of the genes that code for Bt toxins.$\newline$ - Therefore, Statement I is true.$\newline \bullet$Statement II:$\newline$ - Bt toxin is produced as an inactive protoxin in the bacterium Bacillus thuringiensis.$\newline$ - However, the conversion of the protoxin to its active form occurs in the alkaline environment of the insect gut, not acidic.$\newline$ - Therefore, Statement II is false.$\newline$Based on the analysis, the correct answer is:$\newline$Option 1: Statement I is true but Statement II is false.