Assisted reproductive technology, IVF involves transfer of:

The correct answer is Option (2) → Zygote into the fallopian tube

In IVF (in vitro fertilisation), ova and sperms are fused in the laboratory to form a zygote. The zygote, or an early embryo with up to 8 blastomeres, is then transferred into the fallopian tube; this is ZIFT.

Option (1) Ovum into the fallopian tube — Incorrect. Transfer of a donor ovum into the tube is GIFT; no fertilisation is done outside the body.

Option (2) Zygote into the fallopian tube — Correct. In IVF, the ovum is fertilised outside the body, and the zygote or early embryo (up to 8 blastomeres) is transferred into the fallopian tube. This is ZIFT (zygote intra fallopian transfer).

Option (3) Zygote into the uterus — Incorrect. Only embryos with more than 8 blastomeres are put into the uterus (IUT), not the zygote.

Option (4) Embryo with 16 blastomeres into the fallopian tube — Incorrect. An embryo with more than 8 blastomeres goes into the uterus, not the tube.

NCERT Extract:
Infertility – …