A teacher is teaching the concept of 'density of population' in a city at the elementary level. Which of the following information should she provide for clarity on the topic? (A) Number of people living in the city (B) Area of the city (C) Population pyramid of the country Choose the correct option.

A population pyramid that is very broad at the base indicates: (A) High Birth Rate (B) High Life Expectancy (C) Large number of children (D) Low Death Rate Choose the correct option.

Read the statements marked as Assertion (A) and Reason (R) and choose the correct option. Assertion (A): Population explosion happens when the death rate drops rapidly but the birth rate remains high. Reason (R): The birth rate reduces immediately and automatically as soon as health facilities improve.