Write one sentence each using the following terms pertaining to reproduction in humans.

(i) Gestation

(ii) 280 days

(iii) Head first

(iv) Placenta

(v) After-birth

(vi) Tied and cut

(i) The gestation period refers to the full term of the embryo in the uterus.

(ii) In humans, the gestation period is 280 days.

(iii) During parturition, the baby is pushed out by powerful contraction, head first.

(iv) Placenta is the disc like structure attached to the uterine wall.

(v) After about 15 minutes of birth of baby, the placenta breaks from the uterus and is expelled out as "after-birth".

(vi) The umbilical cord is tied and cut after birth.