Fertilization in humans is practically feasible only if:
Correct answer: D. The ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube
- A. The ovum and sperms are transported non-simultaneously to ampullary-isthmic junction of the Fallopian tube
- B. The sperms are transported into cervix within 48 hrs of release of ovum in uterus
- C. The sperms are transported into vagina just after the release of ovum in Fallopian tube
- D. The ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube
Explanation
Fertilization is the process where a haploid male gamete (sperm) and a haploid female gamete (ovum) fuse to form a diploid zygote. In humans, this crucial event occurs at the ampullary-isthmic junction of the Fallopian tube, where the environment is optimal for sperm and egg interaction. The correct answer is Option D because successful fertilization requires the simultaneous presence of both gametes in this location. The other options are incorrect as they describe scenarios where sperm and ovum are not appropriately timed or positioned for fertilization, thus preventing the fusion necessary to initiate development.
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About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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