Fertilization in humans is practically feasible only if:
Answer: (B) The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube. Answer: (B) The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube Solution: Both the ovum and the motile sperms must reach the ampullary region of the fallopian tube at the same time for fusion to occur; this is why not every copulation results in fertilisation.
- A.The sperms are transported into vagina just after the release of ovum in fallopian tube
- B.The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube✓
- C.The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the cervix
- D.The sperms are transported into cervix within 48 hrs. of release of ovum in uterus
Correct Answer
(B) The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube
Solution & Explanation
Answer: (B) The ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube Solution: Both the ovum and the motile sperms must reach the ampullary region of the fallopian tube at the same time for fusion to occur; this is why not every copulation results in fertilisation. Options naming the cervix or uterus as the fertilisation site are wrong, since fertilisation occurs at the ampullary-isthmic junction of the fallopian tube. NCERT Reference: Ch 2, p.35, line 28 — "Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region."