The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. The embryo's heart is formed . . . . . . .
- ABy the end of the second month of pregnancy
- BBy the end of the first trimester
- CAfter one month of pregnancy
- DDuring the fifth month
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Match the following columns regarding human embryonic development:
Column-$I$ (Time of gestation) Column-$II$ (Changes in embryo) $P$. After one month $I$. Major organ systems are formed $Q$. End of second month $II$. Formation of heart $R$. End of three months $III$. Development of limbs and digits $S$. During fifth month $IV$. Movement of fetus and hair on head
| Column-$I$ (Time of gestation) | Column-$II$ (Changes in embryo) |
| $P$. After one month | $I$. Major organ systems are formed |
| $Q$. End of second month | $II$. Formation of heart |
| $R$. End of three months | $III$. Development of limbs and digits |
| $S$. During fifth month | $IV$. Movement of fetus and hair on head |
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View SolutionThe primary function of the $Corpus$ $Luteum$ in humans is to produce:
Breast development during pregnancy is induced by
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View SolutionWhich process is necessary for the development of an embryo from a zygote?
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View SolutionWhich hormone relaxes the pubic symphysis during childbirth?
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