In a country like India,what else is required in addition to milk for proper human nutrition?

Which of the following statements is true?

Wheat : brown rust :: potato : ?

$A$ system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

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.

Match the following columns:

Column-$I$ (Crop)	Column-$II$ (Variety)	Column-$III$ (Insect)
$P$. Brassica	$I$. Pusa Sem $2$ and Pusa Sem $3$	$W$. Aphids
$Q$. Flat bean	$II$. Pusa Gaurav	$X$. Shoot and fruit borer
$R$. Okra	$III$. Pusa Sawani and Pusa $A-4$	$Y$. Jassids,aphids and fruit borer