Question

what will happen if the ovum is not fertilised

Answer 1

if the ovum or egg is not fertilised by sperm then ovum will come out in the place of mensuration or period for females body

Answer 2

Before I launch into the answer to your question, I think a brief overview
of the female reproductive system may be wise. First, you have the ovaries.
These organs store all of the immature egg cells and produce mature egg
cells, or ovum. Next in line are the fallopian tubes, which are
responsible for the transport of the mature ovum to the uterus. The uterus
is a balloon-like sac that has lots of stretchy muscles which holds a
developing fetus when the female is pregnant. The uterus opens into the
vagina, or the birth canal, through which the baby exits the mother’s body.

Once a month (about every 28 days), the ovary produces a mature ovum. It
is released into the fallopian tubes where it takes 3 to 4 days to reach
the uterus. During that time, the uterus thickens its lining in
preparation for the incoming ovum. If the ovum is fertilized, it will
implant itself in this lining. However, if fertilization does not occur
(hey, I’m FINALLY going to answer your question!!) the ovum withers away
and the uterus gets rid of the extra lining through the birth canal. This
process is referred to as menstruation. So as long as the mature ovum
produced every month is not fertilized, this release of uterus lining
occurs once every 28 days.

I hope that answers your question!