Cryopreservation is:

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.

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Orchid	$(P)$ Undifferentiated mass of cells
$(2)$ Methylophilus methylotrophus	$(Q)$ Twice the amount of lysine and tryptophan
$(3)$ Callus	$(R)$ High rate of protein production
$(4)$ Hybrid maize	$(S)$ Embryo rescue

Product of biotechnology is

Which of the following may be considered as an application of biotechnology?

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: