What are carbamates used as?

Select the appropriate option for $RNAi$.

$Bt$ cotton is resistant to pests,such as lepidopterans,dipterans,and coleopterans. Is $Bt$ cotton also resistant to other pests as well?

The $Bt$ (Bacillus thuringiensis) strain was developed as a ...........

In $Bt$ cotton,$Bt$ toxin is present as protoxin,it gets activated because of . . . . . . .

Given below are $2$ statements: one is labelled as Assertion $(A)$ and other is labelled as Reason $(R)$.
Assertion $(A) :-$ Toxic insecticidal protein of Bacillus thuringiensis does not kill Bacillus itself.
Reason $(R) :-$ In Bacillus,$Bt$ toxin protein exists as inactive protoxins.
Correct answer from the options given below :