Question

The first sign of growing human foetus in uterus may be noticed by
A) Listening heart sound
B) Movement of foetus
C) Development of limbs and digits
D) None of the above

Answer 1

Hint:A foetus is the unborn offspring of human or animal which is developed from an embryo and this foetal stage of development is initiated only after the embryonic stage.

Complete answer:
Let us go through each of the options one by one,
Option A: The heart is one of the first organs in the foetus to start getting developed. It is derived from the middle germ layer of the embryonic tissue called the mesoderm and starts to pump blood as early as the 22nd day from fertilization. This is the first sign where an individual can confirm that the foetus is growing and is therefore, the correct option.

Option B: The movement of foetus is not a definitive indication of a growing foetus and the heart starts pumping blood at a very early stage which confirms it as the first sign. Therefore, this option is incorrect.

Option C: The limbs and digits develop at a later stage of the foetal development after around 4 weeks and take upto 8 weeks to develop. Even though it might be an indication of a growing foetus, it is not the first sign for the same. Therefore, this is an incorrect option.

Option D: This is definitely the easiest option to eliminate as option A is already the correct one. Therefore, this is an incorrect option.

Hence the correct answer is option ‘A’.

Note:The average duration of the human gestation period is around 9 months or 280 days which is defined as the period of development for the human foetus.