Crystals of $Bt$ toxin produced by some bacteria do not kill the bacteria themselves because

Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin ?

The tumour inducing capacity of Agrobacterium tumefaciens is located in large extra chromosomal plasmids called

The crops engineered for glyphosate are resistant/tolerant to

$A$ : $RNAi$ 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).