In the world, ______ per cent of the population is engaged in agriculture.

 ____________ is the commercial rearing of silkworms.

___________ and ___________ are two fundamental types of farming.

In the thickly populated areas of monsoon regions of Asia, the major class of farming done is known as_________________.

_______ , ________ , ________ and ________ are animals commonly reared by nomadic herders.