What does $P$ represent in the given figure?

Match the following techniques or instruments with their usage:

Column-$I$	Column-$II$
$(a)$ Bioreactor	$(i)$ Separation of $DNA$ fragments
$(b)$ Electrophoresis	$(ii)$ Production of large quantities of products
$(c)$ $PCR$	$(iii)$ Detection of pathogen, based on antigen-antibody reaction
$(d)$ $ELISA$	$(iv)$ Amplification of nucleic acids

Select the correct option from the following:

Read the following statements and select the incorrect one:
$(I.)$ Disarmed Agrobacterium is used to deliver desirable gene into plant cell.
$(II.)$ In $\text{EcoRI}$,the letter '$R$' is derived from the name of species.
$(III.)$ Gene therapy is a part of modern biotechnology.
$(IV.)$ $\text{DNA}$ is a hydrophilic molecule,so it can easily pass through cell membrane.

Give differences between $PCR$ and plasmid.

In the given figure,what do '$R$','$S$',and '$T$' represent respectively?

Biotechnology is the modern branch of biology which deals with