Which one of the following is the most widely accepted method of contraception in India, at present?
Tubectomy
Diaphragm
$IUDs$ (intra uterine devices)
Cervical caps
Which of the following structure is lacking from the placenta
The maximum growth rate occurs in
Which one of the following is the effect of higher $pH$ on the sperms
In man the foetal membrane which forms the intimate connection with the uterine tissue is
A phenomenon of embryonic induction was first described in amphibia by