Identify the mismatched pair.

Match Column-$I$ with Column-$II$ and select the correct option:

Column-$I$	Column-$II$
$(a)$ $Bt$ Cotton	$(i)$ Gene therapy
$(b)$ Adenosine deaminase deficiency	$(ii)$ Cellular defense
$(c)$ $RNAi$	$(iii)$ Detecting $HIV$ 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.

Match the following columns:

Column $I$	Column $II$
$1.$ $r-DNA$ technology	$a.$ Typhoid
$2.$ $MRI$ technique	$b.$ $AIDS$
$3.$ $ELISA$ test	$c.$ Strong magnetic field
$4.$ Widal test	$d.$ Yeast

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