Fertilisation in humans is practically feasible only if
- the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix
- the sperms are transported into cervix within 48 hrs of release of ovum in uterus
- the sperms are transported into vagina just after the release of ovum in Fallopian tube
- the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube.
Answer
(4) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube.
Solution
As per NCERT, fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the Fallopian tube (oviduct).
⇒ The cervix has no ampullary-isthmic junction, and fertilisation does not take place in the uterus or vagina.
Answer: (4)