Population density means
The number of human per unit area
The number of human in a unit area at a specific time
The concentration of human population at a place
None of above
Sex ratio in a species indicates the numerical relation between the number of
Oral polio vaccine and hepatitis first dose is given to a child at
$A$ birth control implant having six small, plastic cylinders and with the effective period much longer upto $5$ years is
$A$ : Gossypol inhibits spermatogenesis.
$R$ : Centchroman inhibits ovulation
Highest and lowest population in India is in