In maize plants, the insertion of the $CryIAb$ gene makes the plant resistant to which of the following?

In which organism is a specific gene introduced that produces $dsRNA$ and induces $RNA$ interference in nematodes?

Which herbicide is derived from urea and is used for weed control in tea,cotton,and tobacco crops?

In $RNAi$,the genes are silenced using

$A$: $Bt$ toxin are protein crystals containing insecticidal protein.
$R$: $B. \text{ thuringiensis}$ forms these protein crystals throughout continuously during their growth period.

$GM$ brinjal in India has been developed for resistance against: