Which one of the following is NOT an outbreeding device to promote cross pollination?

Step-by-step solution

Outbreeding devices are mechanisms developed by plants to prevent self-pollination and promote cross-pollination. Herkogamy is the presence of a physical barrier between the anther and stigma, which prevents self-pollination. Self-sterility or self-incompatibility is a genetic mechanism that prevents self-pollen from fertilizing the ovules of the same flower. Heteromorphy involves the production of flowers with different lengths of styles and stamens, which promotes cross-pollination. Cleistogamy refers to the cond