In human female the blastocyst
forms placenta even before implantation
gets implanted into uterus 3 days after ovulation
gets nutrition from uterine endometrial secretion only after implantation
gets implanted in endometrium by the trophoblast cells.
Which event is possible when changes in layer of zona pellucida occurs by sperm at fertilizatioi time?
Gastrulation is the process which involves the differentiation of the following layers in a vertebrate embryo
Find $A$ to $D$ in figure
In our society women are blamed for producing female children. Choose the correct answer for the sexdetermination in humans.
Which one of the following statements about human sperm is correct?