Question

In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

• A. Eyelids and eyelashes are formed
• B. Most of the major organ systems are formed
• C. The head is covered with fine hair
• D. Movement of the foetus

Answer 1

The correct option is B Most of the major organ systems are formed

Most of the major organ systems (development of limbs and external genital organs) are formed by the end of 12 weeks (first trimester) of pregnancy.

The first movements of the foetus and appearance of hair on the head are usually observed during the fifth month of pregnancy.

The eyelids separate and eyelashes are formed by the end of about 24 weeks (end of second trimester) of pregnancy