Fertilisation Location & Timing — NEET Biology
✅ Asked in NEET 2016Fertilisation in humans is practically feasible only if:
Fertilisation in humans is practically feasible only if:
Answer & NCERT explanation
Correct answer: D — The ovum and sperms are transported simultaneously to ampullary-isthmic junction of Fallopian tube
Fertilization occurs at ampullary-isthmic junction of fallopian tube, not cervix. Both ovum and sperm must reach this site simultaneously. Ovum is released into fallopian tube during ovulation, and sperm travel through reproductive tract. The ampullary-isthmic junction provides optimal environment for fertilization as described in NCERT.
Read more NCERT concept on the PYQ
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. 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.
NTA tests whether students know that fertilisation occurs specifically in the ampullary region of the fallopian tube, not in the uterus or ovary. The critical concept is that fertilisation requires simultaneous arrival of both ovum and sperms—if timing is off, pregnancy won't occur even after copulation. Students commonly mistake the site of fertilisation or ignore the importance of synchronisation. Remember: ampullary region + simultaneous transport = fertilisation. This explains why contraception timing works and why not every sexual encounter leads to pregnancy, a logically sound concept NTA frequently tests.
What does NCERT say about During copulation coitus semen?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.