Recently the human population has grown almost exponentially becoming about 7 billion because of
A
Recent agricultural revolution
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B
Industrial revolution
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C
Major scientific and medical advances reducing mortality rate
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D
All of the above
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Solution
The correct option is D All of the above The increasing demographic index is a major obstacle for developing economy like India. The world population (the total number of living humans on Earth) was 7.244 billion as of July 2014 according to the medium fertility estimate by the United Nations Department of Economic and Social Affairs, Population Division and it is projected to reach 7.325 billion in July 2015.
The increase in the population rate is mainly due to the factors like agricultural revolution, industrial revolution and major scientific and medical advances in reducing the mortality rate. Life span of human beings had increased tremendously. Thus, the correct answer is option D.