Which of the following is considered the most primary and essential need among the basic requirements of humans?

Which chemical substance is used to remove unwanted weeds?

Blue revolution:
$I$. It is the rapid expansion of intensive commercial aquaculture.
$II$. It aims to increase global food production and reduce widespread hunger.
Which of the statements given above is/are correct?

Mulching helps in

$A$: Encephalomalacia,a disease of poultry,is caused by the protozoan $Eimeria$.
$R$: Encephalomalacia causes bloody diarrhoea in poultry.

Shahtoosh is obtained from: