Answer:
(i) Primary sector:
(a) As the methods of farming changed and
the agricultural sector began to prosper, it produced much more food than
before.
(b) Many people could now take up other activities.
Buying and selling activities increased many times.
(c) However, at this stage most of the
goods produced were natural products from the primary sector and most people
were also employed in this sector.
(ii) Secondary sector:
(a) Over a long time, and especially
because new methods of manufacturing were introduced, factories came up and
started expanding.
(b) Those people who had earlier worked on farms
now began to work in factories in large numbers.
(c) Secondary sector gradually became the
most important sector in the total production and employment.
(d) Hence, over time, a shift had taken
place. This means that the importance of the sectors had changed.
(iii) Tertiary sector:
(a) In the past 100 years, there has been a
further shift from secondary to tertiary sector in developed countries.
(b) The service sector has become the most
important, in terms of total production.
(c) Most of the working people are also
employed in the service sector. This is the general pattern observed in
developed countries.
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