Explain the concept of IVF.

During IVF, fertilization is brought about in the test-tube and the embryo created is implanted in the uterus of the woman at an appropriate time. This fertilization technique is used to have children by childless couples with problems such as less sperm count, obstacles in oviduct and so on. Also, some of the women may have problems in implantation of embryo in the uterus. Such women can adopt a modern remedial technique known as surrogacy. In this technique, oocyte collected from the ovary of the woman having problems in implantation in the uterus is fertilized in a test-tube with the help of sperms collected from her husband. The embryo resulting from such fertilization is implanted in the uterus of some other woman having a normal uterus. Such a woman, in whose uterus the embryo is implanted, is called a surrogate mother.