Match the columns:
Column $I$ Column $II$
$(a)$ Third week $(1)$ Development of pre-umbilical cord
$(b)$ Third month $(2)$ Body develops but head remains big
$(c)$ Fourth week $(3)$ Embryonic slit widens
$(d)$ Fourth month $(4)$ Muscles activate

  • A
    $a-3, b-2, c-1, d-4$
  • B
    $a-1, b-2, c-3, d-4$
  • C
    $a-3, b-4, c-1, d-2$
  • D
    $a-2, b-1, c-4, d-3$

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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:

Progesterone is secreted by.........

Which of the following organs is differentiated first during human embryonic development?

The end of the gastrulation phase is marked by which of the following?

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