Three reproductive techniques for sterile couple are: (i) In vitro fertilisation The fertilisation outside the body in almost similar conditions as that in the body followed by embryo transfer to the mother. This method is popularly known as test-tube baby. (ii) GameteintraFallopian transfer Transfer of an ovum collected from a donor into the Fallopian tube of another female who cannot produce ovum, but can provide suitable . environment for fertilisation and further development. (iii) Intracytoplasmic sperm injection It is another specialised procedure to form an embryo in the laboratory in which a sperm is directly injected into the ovum.