(B) The germination of pollen grains on the stigma occurs within the natural environment of the flower,which is referred to as $In$ $vivo$ germination

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(B) The germination of pollen grains on the stigma occurs within the natural environment of the flower,which is referred to as $In$ $vivo$ germination.$In$ $vivo$ refers to processes that take place within a living organism,whereas $In$ $vitro$ refers to processes performed outside a living organism (e.g.,in a laboratory setting).