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# Assertion: The world population was around 2 billion in 1990 which has rocketed to about 6 billion by 2000.Reason: Increase in longevity due to a decline in death rate, maternal mortality rate, and the infant mortality rate has been some major causes of population explosion.A. Both Assertion and Reason are correct and Reason is the correct explanation for AssertionB. Both Assertion and reason are correct but Reason is not the correct explanation for Assertion.C. Assertion is correct but reason is incorrect.D. Both Assertion and reason are incorrect.

Last updated date: 22nd Jun 2024
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Hint: The word population refers to the number of organisms belonging to the same group or species which live in a geographical area. Depending on the mortality rate, the population of the world increases and decreases. The mortality rate can be defined as the number of deaths that occur in a particular population per unit time.

Complete answer: The measure of the number of organisms of all species which live in a particular geographical area and are capable of interbreeding is referred to as a population. The word population commonly refers to the collection of humans in an area. In simple terms, it can be stated as the number of people residing in a city, state, country, or world. The practice of altering the rate of growth of a human population is called human population control. The population of the world is increasing day by day due to the decline in the mortality rate. The mortality rate is also called the death rate. It can be defined as the measure of the number of deaths that occur in a particular area which is scaled to the size of that area by per unit time. The unit of mortality rate is expressed as deaths per 1,000 individuals per year. A major decline in the maternal mortality rate and the infant mortality rate has increased the population of the world. The maternal mortality rate is referred to as the death of women while she is pregnant. The infant mortality rate can be defined as the death of an infant. Therefore, assertion and reason are correct and reason is the correct explanation of the given assertion.
So, option A is the correct answer.

Note: After the industrial revolution and agricultural revolution, significant growth of population is observed. A process called census is used to determine the population. It involves the process of collecting data, analyzing the collected data, compiling and publishing the data.