The population of India in the early $21$st century was approximately: (in $crore$)

July $11$ is observed as

Which one of the following factors has contributed most to the rapid rise of the human population in the present century?

What are the probable factors that contributed to the population explosion in India?

Which of the following is the most convincing reason for increased population growth in a country?

At the time of independence,our population was approximately ........... billion,which reached near ............ billion in the year $2000$ and crossed ........... billion in $2011$.