Question

Foetal movements and appearance of hair on head occur in _ _ _ _ _ _ month of pregnancy.
A. Fifth
B. Sixth
C. Third
D. Fourth

Answer 1

Hint: In human beings the gestation period is 9 months and 7 days. In addition, major organs like limbs and external genital organs are well developed by the end of 12 weeks and the movement of the foetus can be seen at the end of 20 weeks.

Step by step answer:Gestation can be defined as the period in which the development of the embryo takes place in viviparous animals. The gestation period is the time interval of gestation. The human pregnancy period is divided into 3 trimesters with each of 3 months. The period from the last menstrual cycle to the 13th week is the first trimester. The second trimester is from 14th-27th week and from 28th to 42nd week is the last trimester, the third one. The embryo is called a foetus in the 9th week of pregnancy. The first functional organ heart is developed at around 22days. In the 3rd week, the digestive system starts to develop and is placed properly by the 12th week. Movement of foetus is seen in the fifth month of pregnancy. The baby is fully developed and ready for delivery by the end of 9 months. So, the fetal movements are seen in the 5th month of pregnancy.
Hence, option A is the right answer.

Note: Human embryonic development can be classified into different stages which include the germinal stage, gastrulation, neurulation, development of organs and organ system and finally the facial appearance. The germinal stage consists of fertilization, cleavage, blastulation, implantation and embryonic disc.