The minimum number of females per $1000$ males are found in

“In the absence of environmental resistance the population grows in geometrical ratio when the food is given in arithmetical ratio''. This is

India was amongst the first countries in the world to initiate action plans and programmes at national level to attain reproductive health. The programmes called as 'family planning' were initiated in ______ year in India.

$1^{st}$, $2^{nd}$, $3^{rd}$ dose of $DPT$ is given by

$I$. $6 \;weeks$ after birth

$II$. $10 \;weeks$ after birth

$III$. $14 \;weeks$ after birth

$IV$. $24 \;weeks$ after birth

$V$. $29\; weeks$ after birth

In vivo fertilisation involves the fertilisation that takes place