By what other name is the gene gun known?

Select the incorrect statement from the following.

Which of the following transforms normal plant cells into a tumor?

Which enzyme is used to release $DNA$ from a plant cell?

The diagram below represents a schematic of recombinant $DNA$ technology. Which enzymes are responsible for the processes $P$ and $Q$ respectively?
$\quad\quad P\quad\quad\quad Q$

Restriction enzymes belong to which class of enzymes?