Identify the correct sequence involved in embryonic development of human.
(A) External genitalia are formed
(B) First movement of the foetus is observed
(C) Embryo’s heart is formed
(D) Eye-lids separate and eyelashes are formed
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (C), (A), (B), (D)
(C) Embryo’s heart is formed — this comes first. The heart forms after one month of pregnancy.
(A) External genitalia are formed — this comes second. By the end of 12 weeks (the first trimester), most of the major organ systems are formed, and the limbs and external genital organs are well developed.
(B) First movement of the foetus is observed — this comes third. The first movements are usually noticed during the fifth month.
(D) Eye-lids separate and eyelashes are formed — this comes last. This happens by about 24 weeks, at the end of the second trimester.
NCERT Extract:
Pregnancy and Embryonic Development – …
