Elaborate the answer to the given question:
 
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
 
Answer variants:
vagina
28 days
40 to 300 million sperm
fallopian tube
sperm connects with egg
 
a. Every month, a female releases one egg. The ovary transfers this egg to the
.
 
b. Male partners ejaculate semen in the female reproductive system is called
.
 
c. In one millilitre of semen, between
are present.
 
d. The fertilisation process begins when the
and swims up into the fallopian tube from this location.
 
e. A menstrual cycle lasts for
.