Justify the statement " although geitonogamy is functionally cross pollenation involving a pollinating agent , genetically it is similar to autogamy since pollen grains come from the same plant "

In Geitonogamous flowers the pollen grain comes from the same plant. It is being transferred to the stigma of another flower fo same plant. So it is functionally cross pollination by involving pollinating agent but genetically it is autogamy.

Geitonogamy: Transfer of pollen grains from the anther to the stigma of ANOTHER FLOWER of the SAME plant.Although geitonogamy functionally cross pollination involving pollinating agent,genetically it is similar to autogamy since the pollen grains come to same plant. Xenogamy:Transfer of pollen grains from anther to the stigma of a DIFFERENT PLANT.This is the only type of pollination where pollination brings genetically different type of pollen grains to stigma..