World Population Day is observed on:

Birth rate is directly proportional to

The primary cause behind the rapidly growing population of the world in recent times is

The rate of human population growth is:

The present population growth rate in India is alarming. Suggest ways to check it.

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