In which region of the fallopian tube, fertilization of sperm and ovu…

The correct answer is Option (2) → Ampulla

The fallopian tube (oviduct) has four parts from the ovary to the uterus: fimbriae, infundibulum, ampulla and isthmus. The sperms swim up from the uterus, and the ovum comes down from the ovary; the two meet in the wider middle part.

Option (1) Isthmus — Incorrect. The isthmus is the narrow part joining the uterus; the zygote passes through it while dividing.

Option (2) Ampulla — Correct. Fertilisation, the fusion of a sperm with an ovum, takes place in the ampullary region of the fallopian tube. This is why the ovum and sperm must be transported to the ampulla at the same time.

Option (3) Infundibulum — Incorrect. It is the funnel-shaped part near the ovary that receives the ovum.

Option (4) Fimbriae — Incorrect. These are finger-like projections on the edge of the infundibulum that help collect the ovum.

Note: A similar question was also asked in CUET (UG) 2025 on 30-05-2025 (Slot 1).

NCERT Extract:
Fertilisation and Implantation – “… During copulation (coitus) semen is released by the penis into the vagina (insemination). The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube (Figure 2.11b). The ovum released by the ovary is also transported to the ampullary region where fertilisation takes place.”
Parturition and Lactation – “… After coitus, sperms are transported to the ampulla, where the sperm fertilises the ovum leading to formation of a diploid zygote.”