Which of the following developing countries has a high death rate?

Housing problems,health problems,pollution problems,etc.,are primarily created by:

On which day did the world population reach the $5^{th}$ billion mark?

In India,the number of females per $1,000$ males had been constantly decreasing. In which of the following years did this number increase?

The $20^{th}$ century has witnessed a remarkable increase in the population of the world and especially in India. One major factor for this is that

Per year growth in India's population according to the $1991$ census is (in $\%$)