Which of the following methods is not commonly used for introducing foreign $DNA$ into the plant cell?

Assertion : Insertion of recombinant $DNA$ within the coding sequence of $\beta -$ galactosidase results in colourless colonies.
Reason : Presence of insert results in inactivation of enzyme $\beta -$ galactosidase known as insertional inactivation.

Given below are two statements:
Statement $I:$ The $\text{DNA}$ fragments extracted from gel electrophoresis can be used in the construction of recombinant $\text{DNA}$.
Statement $II:$ Smaller size $\text{DNA}$ fragments are observed near the anode while larger fragments are found near the wells in an agarose gel.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which of the following statements is correct in the context of observing $DNA$ separated by agarose gel electrophoresis?

Which of the following steps is/are catalysed by $Taq$ polymerase in a $PCR$?

Give information about bioreactors.