Q.Fertilisation of the human ovum normally takes place in the

[!TLDR]

Fertilisation normally occurs in the ampullary-isthmic junction of the fallopian tube, shortly after ovulation.

[!ANSWER]

(c) Ampullary-isthmic junction of the fallopian tube

After ovulation, the secondary oocyte is swept by the fimbriae into the fallopian tube. Sperm that have travelled up through the cervix and uterus meet the oocyte in the tube, specifically at the junction between the wider ampulla and the narrower isthmus -- the ampullary-isthmic junction -- which is the normal site of fertilisation. The uterus is where the resulting blastocyst later implants, not where fertilisation itself occurs.

[!ANSWER]

(c) Ampullary-isthmic junction of the fallopian tube

Separate the site of fertilisation (fallopian tube, specifically the ampullary-isthmic junction) from the site of implantation (uterus, in the endometrium) -- these are two different locations at two different times.

Assuming fertilisation happens in the uterus because that is where pregnancy is usually pictured -- the uterus is the site of implantation and subsequent development, not fertilisation.