(a) Where in the human body does an ovum get fertilised?
(b) Where does a fertilised ovum develop into a baby in the human body?

(a) In the human body, an ovum gets fertilized with the sperm in the fallopian tube of the ovary.

(b) A fertilized ovum (in the form of zygote) develops into a baby in the uterus of the female.

Explanation:

Fertilization is the process in which the nuclei of the egg and sperm unite together in the fallopian tube to form a single-celled zygote.

In the fallopian tubes, the sperm and egg meet. After fertilization, the zygote is pushed down towards the uterus with the help of hair-like structures present in the fallopian tube.
The fertilized egg or the zygote undergoes repeated cell divisions while travelling down the uterus to form an embryo. The embryo gets implanted in the soft lining of the uterus. The embryo implantation helps in the further development of the embryo and also to obtain nutrients and oxygen required for its development.

The embryo gradually grows into a fetus.