Q.Explain the classification of industries with examples.

Industries are grouped into three classes depending on whether they extract raw material, convert it into a product, or support production and trade with services.

Industry is classified into three broad categories based on the nature of the activity performed. Primary industry is concerned with extracting or producing natural resources and has two branches: extractive industries, which draw resources directly from nature, such as mining, fishing, forestry and agriculture; and genetic industries, which breed and multiply plants or animals for profit, such as poultry farms, plant nurseries, cattle-breeding farms and fish hatcheries. Secondary industry takes the raw material supplied by primary industry and converts it into a finished or semi-finished product, and it also has two branches: manufacturing industries, which change the form of raw material through analytical processes (like refining crude oil into petrol and diesel), synthetic processes (like making cement from limestone and gypsum), processing (like milling paddy into rice) or assembling (like putting together the parts of a bicycle); and construction industries, which build immovable structures such as buildings, dams, roads and bridges. Tertiary industry consists of service industries that do not themselves produce goods but support primary and secondary industry as well as commerce by rendering essential services such as banking, insurance, transport, warehousing, communication and advertising. The three classes are interlinked: primary supplies the raw material, secondary converts it into a usable product, and tertiary keeps the whole chain running and eventually connects the finished product to commerce.

Students frequently forget to split primary industry into extractive and genetic types, or forget to split secondary industry into manufacturing and construction, both of which examiners specifically look for in a full-mark answer.