Fertilization in humans is practically feasible only if

the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube

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the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the cervix

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the sperms are transported into cervix within

48

hours of release to ovum in uterus

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the sperms are transported into vagina just after the release of ovum in fallopian tube.

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Solution

The correct option is A the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube
Ampulla averages 5–8 cm in length. It is within this highly ciliated portion of the oviduct that fertilization and early embryo development occur. The ampulla is most often also the site for ectopic implantation (ectopic pregnancy). The next region, approximately 2–3 cm in length, is the isthmus. Like the ampulla, it too is ciliated yet less densely so. The isthmus is thought to regulate sperm and embryo transport.
So, the correct option is 'the ovum and sperms are transported 'simultaneously to ampullary - isthmic junction of the fallopian tube'

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