Question

article on three sector of economy and their contribution in national income.

Answer 1

In our daily life we observe many people working outside their homes. we see many people doing agriculture, labourers, industrial workers, people working in call sectors etc; It means that we had observed all the 3 sectors of our society. those are:
1. PRIMARY SECTOR [agricultural sector]
2. SECONDARY SECTOR [industrial sector]
3. TERTIARY SECTOR [service sector]
=>Primary sector: This sector is also known as "Agricultural sector", is the first and important sector of the society. This sector comprises mainly of agriculture, but this also involves cattle rearing, forestry, fishing, mining etc; This sector produce natural substances and these would be sent to secondary sector for further manufacturing's.
=>Secondary sector: This sector is also known as "Industrial sector". this sector is mostly related to machines. the products produced by the 1st sector are further processed by this sector. like: the cotton produced by the 1st sector is converted into threads and clothes by this sector.
=>Tertiary sector: This sector is also known as "Service sector". This sector provides service to all the people. like the 1st and the 2nd sector they do not produce any products. 

But 3 sectors are very important for the society.
=>After independence i.e. between 1972-73 the agricultural sector produces an income of 72%, industrial sector produces 11%, and service sector produces 17%.
=>But between 2011-12 the agricultural produces an income of 49%, industrial sector produces 22%, and service sector produces 29%.

So there are many variations from year to year in every sector.