In vivo fertilisation involves the fertilisation that takes place

  • A

    In the laboratory

  • B

    In the uterus

  • C

    Outside the uterus

  • D

    Either $(a)$ or $(b)$

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In which one of the following the birth rate is high & death rate is normal

Match the following columns

Column-I Column- II
$(A)$ Pill $(1)$ Intra uterine device
$(B)$ Condom $(2)$ Prevents ovulation
$(C)$ Vasectomy $(3)$ Prevents sperms from reaching to cervix
$(D)$ Cu - T $(4)$ Semen contains no sperms

 

Cause of decline of population in $1927$ was