Match List-I with List-II.
| List-I | List-II |
| (A) Gestation | (I) Delivery of the baby |
| (B) Parturition | (II) Formation and development of blastocyst and its attachment to the uterine wall |
| (C) Implantation | (III) Transfer of sperms into the female genital tract |
| (D) Insemination | (IV) Embryonic development |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-IV, B-I, C-II, D-III
The book lists the reproductive events of humans in the order in which they happen, and each event has its own name.
(A) Gestation — this matches (IV) Embryonic development. Gestation is the development of the embryo inside the uterus; in humans this period lasts about nine months.
(B) Parturition — this matches (I) Delivery of the baby. At the end of pregnancy, strong contractions of the uterus push the fully developed foetus out through the birth canal.
(C) Implantation — this matches (II) Formation and development of blastocyst and its attachment to the uterine wall. The trophoblast of the blastocyst attaches to the endometrium and the blastocyst gets embedded in it, which leads to pregnancy.
(D) Insemination — this matches (III) Transfer of sperms into the female genital tract. During coitus, semen is released by the penis into the vagina.
NCERT Extract:
Human Reproduction – “As you are aware, humans are sexually reproducing and viviparous. The reproductive events in humans include formation of gametes (gametogenesis), i.e., sperms in males and ovum in females, transfer of sperms into the female genital tract (insemination) and fusion of male and female gametes (fertilisation) leading to formation of zygote. This is followed by formation and development of blastocyst and its attachment to the uterine wall (implantation), embryonic development (gestation) and delivery of the baby (parturition).”