Question
Match List I with List II related to embryonic development at various months of pregnancy:
| List-I | List-II | ||
|---|---|---|---|
| A. | The foetus movement starts and hair appears on the head | (I) | 24 weeks of pregnancy |
| B. | The foetus develops limbs and digits | (II) | 20 weeks of pregnancy |
| C. | The foetus develops external genital organs | (III) | 8 weeks of pregnancy |
| D. | The foetus body is covered with fine hair; eyelids separate and eyelashes are formed | (IV) | 12 weeks of pregnancy |
Choose the correct answer from the options given below:
Options
Solution
Sol. [Key Concept: Embryonic development month-by-month]
- By the end of second month of pregnancy (8 weeks), the foetus develops limbs and digits
- By the end of 12 weeks (first trimester) of pregnancy, most of the major organ system are formed. The limbs and external genital organs are also well developed.
- During the fifth month (20 weeks) of pregnancy, the first movements of the foetus and appearance of hair on the head are usually observed.
- By the end of about 24 weeks (ends of second trimester) of pregnancy, the body is covered with fine hair, eye lids separate and eyelashes are formed.
So, the correct match is A-II, B-III, C-IV, D-I
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