Assertion:. Change of population in particular area between two points of time is known as growth of population.
Reasoning: Population change in an area is not an important indicator of economic development, social upliftment and historical and cultural background of the region.

Assertion (A) is true but Reasoning (R) is not correct.

The correct answer is option 3: Assertion (A) is true but Reasoning (R) is not correct.

Assertion:. Change of population in particular area between two points of time is known as growth of population. Correct.  Population Growth refers to the increase or decrease in population between two time periods.
Reasoning: Population change in an area is not an important indicator of economic development, social upliftment and historical and cultural background of the region. False. Population change in an area is an important indicator of economic development, social upliftment and historical and cultural background of the region. As for example: Rapid growth or decline often correlates with job opportunities or economic distress. Similarly, changes in birth/death rates often indicate improvements in healthcare and education.

NCERT: "The population growth or population change refers to the change in number of inhabitants of a territory during a specific period of time. This change may be positive as well as negative. It can be expressed either in terms of absolute numbers or in terms of percentage."