Dioecy in some plants can prevent ________ .

Step-by-step solution

Dioecy is the condition in which male and female flowers are borne on different plants, meaning each individual plant is either male or female (e.g., papaya). Since a single plant does not possess both male and female reproductive organs, self-pollination cannot occur. Therefore, this condition prevents both autogamy (pollination within the same flower) and geitonogamy (pollination between different flowers of the same plant). It promotes xenogamy (cross-pollination), which is the transfer of pollen grains from the