Fertilisation Location & Timing — NEET Biology
✅ Asked in NEET 2016During 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.
Fertilisation in humans is practically feasible only if:
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