What does $P$ represent in the given figure?

Which of the following bacteria is a close relative of $Salmonella$?

Match the columns:

Column-$I$	Column-$II$
$(a)$ Ethidium Bromide	$(i)$ Agrobacterium
$(b)$ Ti plasmid	$(ii)$ Tetracycline
$(c)$ $PvuI$	$(iii)$ Gel electrophoresis
	$(iv)$ Ampicillin

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.

Identify the correct match for the given apparatus.
Apparatus $\to$ Function

The given figure shows the cloning vector $pBR322$. Identify the labels $A, B, C,$ and $D$ correctly.