Artificial breeding of cattle is brought about by

$A$: Improved varieties with genetic variations can be obtained through plant breeding.
$R$: The main objectives of plant breeding are similar to those of animal breeding.

What is required to obtain a variety with genetic variation?

Match the following columns:

Column-$I$	Column-$II$
$P$. Insecticides	$I$. Pesticides
$Q$. Pesticides	$II$. Weedicides
$R$. Weedicides	$III$. Insecticides

Identify the correct statements:
$(i)$ Modern techniques are implemented to increase the production of plants and animals in marine habitats.
$(ii)$ Catla,Rohu,Mrigal,Hilsa,and Major Carps are types of fish.
$(iii)$ Hilsa,Sardines,Rohu,and Mrigal are marine edible fish.
$(iv)$ Fisheries can be of saltwater or freshwater types.

Mention any two examples of plants used as wind breakers in the agricultural fields.