Mark the incorrect statement.

  • A
    Polyspermy is prevented by depolarization of the membrane,which is called a fast block.
  • B
    Entry of sperm into the ovum restarts the cell cycle by breaking down $MPF$ and turning on the $APC$.
  • C
    If implantation occurs anywhere else other than the uterus,it is called tubal pregnancy.
  • D
    Ability to reproduce is lost in female primates after menopause.

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Natural parthenogenesis is found in

Where does the structural transformation of sperm occur?

$A$ freshly unfertilized egg of a hen contains:

Match the columns.
Column $I$ Column $II$
$(a)$ Corpus luteum $(1)$ Initially in abdominal cavity then in scrotum
$(b)$ Testis $(2)$ At the anterior part of scrotum in male
$(c)$ Myometrium $(3)$ Graafian follicle
$(d)$ Penis $(4)$ Uterus

Some important events in the human female reproductive cycle are given below. Arrange the events in a proper sequence. $A \rightarrow$ secretion of $FSH$,$B \rightarrow$ growth of corpus luteum,$C \rightarrow$ growth of the follicle and oogenesis,$D \rightarrow$ ovulation,$E \rightarrow$ sudden increase in the level of $LH$.

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