To solve this problem, we need to understand the concept of geitonogamy.$\newline \bullet$Geitonogamy is a type of pollination.$\newline \bullet$It involves the transfer of pollen from one flower to another flower on the same plant.$\newline \bullet$This means that the pollen is transferred between different flowers of the same individual plant.$\newline \bullet$Although it involves two different flowers, it is still considered a form of self-pollination because the genetic material comes from the same plant.$\newline$Now, let's analyze the options:$\newline \bullet$Option 1: Fertilization of a flower by the pollen from another flower of the same plant.$\newline$ - This correctly describes geitonogamy.$\newline \bullet$Option 2: Fertilization of a flower by the pollen from another same flower.$\newline$ - This describes autogamy, not geitonogamy.$\newline \bullet$Option 3: Fertilization of a flower by the pollen from a flower of another plant in the same population.$\newline$ - This describes xenogamy, which is cross-pollination.$\newline \bullet$Option 4: Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.$\newline$ - This also describes xenogamy, specifically distant cross-pollination.$\newline$Therefore, the correct option is Option 1, which accurately describes geitonogamy.