Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 2. human reproduction1 Mark
MCQ
Which of the following organ is differentiated first during development ?
✓
Heart
B
Skin
C
Brain
D
Neural tube
✓
Answer
Correct option: A.
Heart
a In human beings, after one month of pregnancy, the embryo's heart is formed. By the end of second month of pregnancy limbs and digits are developed. By the end of $12$ weeks (first trimester) most of the major organ systems are formed.
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