Mention the similarity between autogamy and geitonogamy . How does geitonogamy differ from xenogamy.

Dear student,
Autogamy is the transfer of pollen grain from anther to stigma of the same flower in the same plant. Geitonogamy is also the transfer of pollen grain from anther to stigma of the different flower in the same plant. So, autogamy and geitonogamy is the process of self pollination in the same plant.

Geitonogamy	Xenogamy
The pollen grains of one flower reach the stigma of another flower of the same plant.	The pollen grains of one flower reach the stigma of same type of flower in a different plant.

Regards