Which branch of biology utilizes knowledge of microorganisms for human welfare?

In India,the first international meeting on biotechnology was held in which year?

The transfer of the streptomycin resistance gene from $Nicotiana$ $tabacum$ to $Nicotiana$ $sylvestris$ was achieved through which method?

Read the following four statements and identify the two incorrect statements:
$(1)$ The first transgenic buffalo,Rosie,produced milk enriched with human alpha-lactalbumin.
$(2)$ $DNA$ is isolated from large molecules using restriction enzymes.
$(3)$ Downstream processing is a stage of $r$-$DNA$ technology.
$(4)$ Disarmed pathogen vectors are also used to transfer $r$-$DNA$ into the host.

Biotechnology and its applications include:
$1.$ Therapeutics
$2.$ Agriculture
$3.$ Diagnosis
$4.$ Bioremediation

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: