Final answer:
Fertilization of the ovum takes place in the fallopian tube, where the sperm and egg unite. The egg releases molecules to guide the sperm and allows them to attach before fertilization occurs.
Step-by-step explanation:
The fertilization of the ovum takes place in the fallopian tube. Sperm are deposited in the vagina during sexual intercourse and they swim through the cervix, uterus, and into the fallopian tube. Once in the fallopian tube, the sperm travel towards the secondary oocyte (egg) with the help of tubular fluids. The egg releases molecules that guide the sperm and allow them to attach to its surface. The egg then absorbs the sperm, leading to fertilization.