Which catfish has become a threat to the indigenous catfish in our rivers?

Even though the highest number of varieties of this rice are found in India,which variety of rice was patented by a $U.S.$ company?

Which of the following is commonly used for the transfer of foreign $DNA$ into crop plants?

Given below are two statements:
Statement-$I$: In $\text{pBR}-322$,the restriction site of $\text{BamHI}$ is present on the $\text{Ampicillin}$ resistance gene.
Statement-$II$: $\text{RNAi}$ technique was used in the formation of nematode-resistant plants.
In the light of the above statements,choose the correct answer from the options given below:

$Bacillus$ $thuringiensis$ is a bacterium of

$Bacillus\, thuringiensis$ $(Bt)$ strains are used to design: