The method of directly injecting a sperm into ovum in assisted reproductive technology is called
ICSI
ICSI is intra cytoplasmic sperm injection. It is one of the techniques of Assisted Reproductive Technology (ART) that help couples to overcome their infertility. In ICSI, sperm is directly injected into ovum in vitro to form zygote.
Embryo is later implanted through ZIFT into the uterus of the woman.
GIFT is Gamete Intra Fallopian Transfer.