B. Seeds are the result of sexual reproduction.
C. Double fertilization is a reproductive process unique to plants.
E. Male and female structures may be present on a single plant.
Option A is incorrect because in some plant species, male and female structures may be present on the same flower, allowing for self-fertilization.
Option D is incorrect because spore formation also occurs in some fungi and protists.
Option F is incorrect because fruit production is the result of sexual reproduction in plants, specifically the development of the ovary after fertilization.