Biology · Human Reproduction · NEET
The order is: gametogenesis → insemination → fertilisation → implantation → gestation → parturition. First gametes are formed (sperm in males, ovum in females). Then sperm are transferred into the female tract (insemination). Sperm and ovum fuse (fertilisation) to form a zygote. The blastocyst attaches to the uterine wall (implantation). The embryo develops (gestation). Finally the baby is delivered (parturition). NEET often asks this exact sequence, so learn it in order.
Insemination is only the transfer of sperm into the female genital tract. Fertilisation is the actual fusion of the male gamete (sperm) and female gamete (ovum) to form a zygote. Insemination happens first and is just delivery; fertilisation happens later inside the ampulla of the oviduct. Students often mix these two, so remember: insemination = sperm reaches the tract, fertilisation = sperm meets and fuses with the egg.
Fertilisation comes first. Fertilisation forms the zygote in the oviduct. The zygote then divides (cleavage) to form a morula and later a blastocyst as it moves to the uterus. Only after this does implantation happen, where the blastocyst attaches to the uterine wall. So the order is fertilisation → cleavage → blastocyst → implantation. Implantation can never come before fertilisation.
Yes. Gametogenesis is the first reproductive event. It is the formation of gametes: sperms in the male (spermatogenesis) and ovum in the female (oogenesis). Without gametes there can be no fertilisation, so gametogenesis is counted as the starting event in the human reproduction chapter of NCERT.
Viviparous means the young ones develop inside the mother's body and are born live, not laid as eggs. Humans are viviparous because the embryo develops inside the uterus, gets nourishment through the placenta during gestation, and is delivered as a baby at parturition. NCERT clearly states humans are sexually reproducing and viviparous, and this fact is a common one-line NEET point.
Before puberty the reproductive organs are not fully mature and the hormones needed for gamete formation are not yet at the required level. At puberty, hormonal changes trigger gametogenesis and the reproductive system becomes functional. So all these events — gamete formation, fertilisation, pregnancy — begin only after puberty.
Select the correct sequence for transport of sperm cells in male reproductive system.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Gametogenesis, insemination, fertilisation, implantation, gestation and parturition, in that order.
Fertilisation takes place in the ampulla, the widest part of the oviduct (fallopian tube), where the sperm and ovum fuse to form a zygote.
Parturition is the process of delivery of the fully developed foetus, that is, childbirth at the end of gestation.
There are key differences. For example, sperm formation continues even in old age in men, but ovum formation stops in women around the age of fifty (menopause).
Fertilisation forms the zygote, when the male gamete (sperm) fuses with the female gamete (ovum).
