Question

Classify industries on the basis of their main role. How are they different from each other

Answer 1

According to their main role
(a) Basic or key industries which supply their products or raw materials to manufacture other goods 8.3. Iron and steel and coppers melting, aluminum smelting.
(b) Consumer industries that produce goods for direct use by consumers-sugar, toothpaste, paper, sewing machines, fans etc. 

Answer 2

It is classified into 2 basic or key and consumer.badic:it means the industry is the producer of raw materials for other industry such as aluminum smelting and iron smelting

.consumer:it means the industry is the producer of finished products such as soap ,perfumes ,cosmetics etc