Oral polio vaccine and hepatitis first dose is given to a child at
$6$ weeks after birth
$10$ weeks after birth
$20$ weeks after birth
$24$ weeks after birth
For determination of sex, body cells are taken from
Which of the following viruses is not transferred through semen of an infected male?
Female condoms are called
“In the absence of environmental resistance the population grows in geometrical ratio when the food is given in arithmetical ratio''. This is
Closely related, morphologically similar sympatric populations, but reproductively isolated, are designated as