In human females,the menstrual cycle repeats at an average interval of ....... days.

  • A
    $18-19$
  • B
    $28-29$
  • C
    $38-39$
  • D
    $50-51$

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$A$ decrease in the level of oestrogen and progesterone causes:

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Match the items given in Column $I$ with those in Column $II$ and select the correct option given below:
Column $I$ Column $II$
$(a)$ Proliferative Phase $(i)$ Breakdown of endometrial lining
$(b)$ Secretory Phase $(ii)$ Follicular phase
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Why are menstrual cycles absent during pregnancy?

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