The specialised procedure of forming an embryo in the laboratory in which a sperm is directly injected into the ovum is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Intra cytoplasmic sperm injection
Assisted reproductive technologies (ART) help couples who cannot have children in the normal way. In most of them, fertilisation is done outside the body or the gametes are placed inside with help.
(1) Gamete intra fallopian transfer — Incorrect. In GIFT, an ovum from a donor is put into the fallopian tube of a woman who cannot make ova but can support fertilisation and pregnancy. Fertilisation happens inside the body.
(2) Intra uterine transfer — Incorrect. In IUT, an embryo with more than 8 blastomeres, formed in the laboratory, is put into the uterus.
(3) Intra cytoplasmic sperm injection — Correct. In ICSI, a single sperm is directly injected into the ovum in the laboratory to form the embryo.
(4) Zygote intra fallopian transfer — Incorrect. In ZIFT, a zygote or early embryo with up to 8 blastomeres, formed in the laboratory, is put into the fallopian tube.
NCERT Extract:
Infertility – …
