$Bt$ is resistant to .........

Cultivation of $Bt$ cotton has been much in the news. The prefix $Bt$ means

"Crown gall" is caused by

$A$ : $RNAi$ takes place in all eukaryotic organisms as a method of cellular defense.
$R$ : Complementary $dsRNA$ molecule binds to specific $mRNA$ and prevents its translation (silencing).

In transgenics,the expression of a transgene in target tissue is determined by

The important objective of biotechnology in the agriculture sector is: