The correct answer is A is true, but R is false. Explanation & Key Takeaways: • Assertion (A): Population growth is expressed in both absolute terms and percentage rate. • Population growth refers to the increase in the number of people in a specific area over a certain period. • This growth is measured in two ways: • Absolute terms: This represents the total number of people added to the population during a specific period. • Percentage rate: This shows the rate of increase in population as a proportion of the existing population, expressed as a percentage. • Using both absolute and percentage terms provides a comprehensive understanding of population dynamics, including the scale of growth and its relative impact on resources and infrastructure. • Hence, Assertion (A) is correct. • Reason (R): Using only absolute growth figures gives sufficient understanding of long-term demographic patterns. • This statement is incorrect because relying solely on absolute growth figures does not provide a complete understanding of demographic trends. • Absolute figures show the magnitude of population growth but fail to account for factors like the relative size of the population or growth rates, which are crucial for analyzing demographic patterns over time. • The percentage growth rate is critical for understanding trends such as population doubling time, resource requirements, and the impact of population growth on economic and social systems. • Hence, Reason (R) is false. • Conclusion: While Assertion (A) is true, Reason (R) is false and does not explain the assertion. Related Concepts: • Methods of Measuring Population Growth: • Absolute Growth: It is calculated as the difference between the population at two different points in time. For example, if the population of a country was 1 billion in 2000 and 1.2 billion in 2020, the absolute growth is 200 million. • Percentage Growth Rate: This measures the annual growth rate as a percentage of the initial population. It is calculated using the formula: Growth Rate (%) = [(Population at End - Population at Start) / Population at Start] × 100. • Importance of Measuring Growth in Different Ways: • Absolute growth: Helps in understanding the total increase in population and its direct impact on resources like food, water, and housing. • Percentage growth: Provides a clearer picture of how fast a population is growing relative to its size, which is crucial for future planning and resource allocation. • Examples: • The Indian Census, conducted every 10 years, reports both absolute and percentage growth figures. • For instance, India’s population grew by approximately 181 million (absolute growth) between 2001 and 2011, with a percentage growth rate of 17.7%. Important Notes: • Demographic Patterns: • Population growth impacts economic development, urbanization, and environmental sustainability. • High growth rates often strain resources, while low or negative growth may lead to challenges like an aging population. • Global Statistics: • The world population was approximately 8 billion in 2023, with regions like Sub-Saharan Africa experiencing the highest growth rates. • Some countries like Japan and Italy are experiencing negative growth due to low birth rates and aging populations.