@donasmrs-- Ovaries are where eggs develop. If the ovaries are removed, the woman will no longer have eggs which means that her periods will end and she won't be able to conceive children anymore.
Every month, an egg develops in the ovaries an moves into the fallopian tubes where it may or may not be fertilized. If it's not fertilized, menstruation occurs. If it's fertilized, then the fertilized egg moves into the uterus and develops into an embryo and eventually an infant.
Sometimes the uterus is removed along with the ovaries during surgery, sometimes it is left. Either way, the body will no longer produce estrogen which means that the woman enters menopause.