From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Dioecious plants bearing only male or female flowers
Monoecious plants are those that bear both male or female flowers on a plant, while dioecious plants can bear either male or female flowers on a plant. in Dioecious and monoecious plants actually have something in common, in that they both bear unisexual flowers. This means that each bloom has only male or female reproductive parts. With dioecious plants, the male and female blossoms appear on separate plants.
Chasmogamous flowers are commonly known as ‘open flowers’. Chasmogamous flowers can undergo both self and cross-pollination.
Cleistogamous flowers are intersexual. They remain closed causing self-fertilisation. So even though this condition can prevent geitonogamy but it cannot prevent autogamy.