Read the following statements about the pregnancy of humans.
I) Most of the major organ systems are formed by the end of first trimester.
II) The end of second trimester is the beginning of the foetal heart sound.
III) The first movements of the foetus fetususually observed in the middle of second trimester.
IV) The placenta is formed around the developing foetus in the beginning of third trimester.
In the above the correct statements are

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II and III only

I and III only

II, III and IV only

I, II and IV only

answer is B.

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Detailed Solution

I) Most of the major organ systems are formed by the end of first trimester.
II) Foetal heart sound can be heard after first month of pregnancy.
III) The first movements of the foetus usually observed in the middle of second trimester.
IV) The placenta is formed during the implantation itself.

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