Fertilization in human female takes place in -

The correct answer is Option (3) → Ampullary region of fallopian tube

The fallopian tube (oviduct) has three parts: the funnel-shaped infundibulum with finger-like fimbriae near the ovary, the wider ampulla, and the narrow isthmus joining the uterus. The fimbriae collect the ovum released by the ovary.

Option (1) Uterus — Incorrect. The uterus is where the embryo implants, not where the gametes fuse.

Option (2) Fimbriae portion of fallopian tube — Incorrect. The fimbriae only collect the ovum after ovulation.

Option (3) Ampullary region of fallopian tube — Correct. Fertilisation can occur only if the ovum and sperms reach the ampulla at the same time.

Option (4) Isthmus region of fallopian tube — Incorrect. The isthmus is the narrow last part of the tube, through which the dividing embryo later moves to the uterus.

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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. Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region. This is the reason why not all copulations lead to fertilisation and pregnancy.”