The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.
By the end of the second month of pregnancy
By the end of first trimester
After one month of pregnancy
During fifth month
The main function of tropho ectoderm in mammalian embryo is
Endometrium is found in
If an unfertilized egg is pricked with a micro needle, it will
The permeability of the human placenta to macro-molecules is evidenced by the presence of following in foetal blood
In man sperms move after ejaculation at a rate of nearly