Modern biotechnology includes:

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ $Bt$ cotton	$(i)$ Gene therapy
$(b)$ Adenosine deaminase deficiency	$(ii)$ Cellular defence
$(c)$ $RNAi$	$(iii)$ Detection of $HIV$ infection
$(d)$ $PCR$	$(iv)$ Bacillus thuringiensis

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$a$. Gene gun	$i$. Replacement of a faulty gene by a normal healthy gene
$b$. Gene therapy	$ii$. Used for transfer of gene
$c$. Gene cloning	$iii$. Total $DNA$ in the cells of an organism
$d$. Genome	$iv$. To obtain identical copies of a particular $DNA$ molecule

Choose the correct answer from the options given below:

Statement $I$: $\text{RNA}$ interference $\text{(RNAi)}$ takes place in all eukaryotic organisms as a method of cellular defense.
Statement $II$: $Bt$ toxin protein is converted into an active form of toxin due to the alkaline $pH$ of the gut of an insect.

Which branch of biology utilizes knowledge of microorganisms for human welfare?

Which of the following is $NOT$ a biotechnological product?