Which of the following statements is incorrect?

  • A
    The menstrual flow results due to the breakdown of the endometrial lining of the uterus.
  • B
    Menstruation only occurs if the released ovum is not fertilised.
  • C
    Lack of menstruation may be an indicator of pregnancy.
  • D
    The follicular phase is followed by the menstrual phase.

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In the $Freemartin$ condition,which of the following is true?

$A$ single ejaculation contains $...A...$ to $...B...$ million spermatozoa. Semen has a pH of $...C...$ to $...D...$. Its alkalinity helps to neutralize the acidity of the urethra. Here $A, B, C$ and $D$ refer to:

$A$: $LH$ acts on Sertoli cells for release of certain factors required for spermatogenesis.
$R$: Spermiation occurs directly under the influence of $LH$.

$A$ female of $24$ years age attained puberty at the age of $14$ years. She has two children born by normal delivery. How many polar bodies are formed in her body till date $($each $\text{M.C.}$ is of $30$ days$)$ :-

With reference to human beings,find out the mismatch pair.

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