To solve this problem, we need to understand the different types of pollination based on the transfer of pollen grains. Let's analyze each term:$\newline \bullet$Xenogamy:$\newline$ - Xenogamy refers to the transfer of pollen grains from the anther of one plant to the stigma of a different plant.$\newline$ - This process involves genetically different plants, leading to genetic diversity.$\newline$ - Therefore, xenogamy is the correct term for the given definition.$\newline \bullet$Geitonogamy:$\newline$ - Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower on the same plant.$\newline$ - It does not involve different plants, so it does not match the given definition.$\newline \bullet$Chasmogamy:$\newline$ - Chasmogamy refers to the opening of flowers to expose the reproductive organs for pollination.$\newline$ - It is not specifically related to the transfer of pollen between different plants.$\newline \bullet$Cleistogamy:$\newline$ - Cleistogamy is the process where flowers do not open, and self-pollination occurs within closed flowers.$\newline$ - This does not involve different plants and is not related to the given definition.$\newline$Based on the analysis, the correct term for the transfer of pollen grains from anthers of one plant to stigma of a different plant is:$\newline$Option 1: Xenogamy