Which term defines a plant or animal that has exclusively male or female reproductive organs?

The term that defines a plant or animal that has exclusively male or female reproductive organs is "Dioecious." In dioecious species, individuals are distinctly male or female, meaning that one can find separate organisms for each sex within a population. This separation into distinct sexes requires both male and female individuals for reproduction, which can lead to increased genetic diversity.

For example, many plants such as holly and kiwifruit, and various animal species like certain fish and reptiles demonstrate dioecious characteristics. In these species, those classified as male produce pollen or sperm, while females develop ovules or eggs, necessitating the cooperation of both sexes for successful reproduction.

While the other terms reference different reproductive strategies, they do not specifically denote exclusively male or female reproductive organs. Monoecious plants have both male and female reproductive structures within the same individual, polygamous refers to a mating system involving multiple partners, and unisexual suggests the existence of only one sex but is a broader term that may apply to those with mixed sex characteristics.