According to $2001$ census, the population growth rate was
$2.6\;\%$
$1.7\;\%$
$2.1\;\%$
$2.7\;\%$
For determination of sex, body cells are taken from
Which of the following statements about hepatitis$-B$ is incorrect?
The population growth of India from $1981$ to $1991$ is
“Population is an auto-regulated system'' was said by