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Industries may be divided into three broad categories namely primary, secondary and tertiary.
  1. Primary industries: This is also known as a extractive industries. It include activity and connected with the production of wealth directly from natural resources. Such as like water, air and land etc. all those activities, which are connected with the extraction and production of natural resources and reproduction and development of living organisms, plants etc. These industries may be further subdivided as follows:
    1. Extractive industries: These industries extract or draw out products from natural sources. Extractive industries supply some basic raw materials that are mostly products of the soil. Products of these industries are usually transformed into many other useful goods by manufacturing industries. Important extractive industries include farming, mining, lumbering, hunting and fishing operation.
    2. Genetic industries: IT means parentage or heritary. These industries remain engaged in breeding plants and animals for their use in further reproduction. For the breeding of plants, the seeds and nursery companies are typical examples of genetic industries. In addition, activities of cattle-breeding farms, poultry farms, and fish hatchery come under the class of genetic industries.
  2. Secondary industries: IN this converting raw material in to finishing product. These are concerned with using the materials, which have already been extracted at the primary stage. These industries process such materials to produce goods for final consumption or for further processing by other industrial units. For example, the mining of an iron ore is a primary industry, but manufacturing of steel is a secondary industry. Secondary industries may be further divided as follows:
    1. Manufacturing industries: they are concerned with the changing of the raw material and semi finishing goods in to finished product. They turn out diverse finished products, that we consume, through the conversion of raw materials or partly finished materials in their manufacturing operations. Manufacturing industries may be further divided into our categories on the basis of method of operation for production.
      • Synthetical industry: which combines various ingredients into a new product, as in the case of cement.
      • Analytical industries: involves successive stages for manufacturing finished products, as in the case of sugar and paper.
      • Assembling industry: which assembles different component parts to make a new product, as in the case of television, car, computer, etc.
    2. Construction industries: These industries are involved in the construction of buildings, dams, bridges, roads as well as tunnels and canals. Engineering and architectural skills are an important part in construction industries.
  3. Tertiary industries: These are concerned with providing support services to primary and secondary industries as well as activities relating to trade. These industries provide service facilities. As business activities these may be considered part of commerce because as auxiliaries to trade they assist trade. Included in this category are transport, banking, insurance, warehousing, communication, packaging and advertising.

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