dioecious
/dai'i:ʃəs/
Definition
- Adjective:
- Having male and female reproductive organs on separate individual organisms: In biology, "dioecious" describes a species where individual organisms are distinctly either male or female. A single plant or animal possesses reproductive organs of only one sex.
Usage
- The term is primarily used in biological and botanical contexts to describe the sexual reproduction system of a species.
- It is the opposite of "monoecious," where a single individual has both male and female reproductive organs.
- It applies to both plants and animals.
Examples
- In Botany:
- Holly trees are dioecious; you need both a male and a female tree planted near each other to get berries.
- The farmer had to ensure he had both male and female kiwi vines because they are a dioecious species.
- In Zoology:
- Most bird species are not dioecious; they have individuals that are either male or female. (This is a general statement about sexual separation, which is the norm for birds, making them dioecious by definition.)
Advanced Usage
- Evolutionary Biology: The dioecious condition is studied in relation to plant breeding systems, genetic diversity, and evolutionary strategies.
- The evolution of dioecy in plants is often linked to mechanisms that prevent self-fertilization.
- Horticulture and Agriculture: Knowledge of whether a crop is dioecious is crucial for cultivation and fruit production.
- For dioecious crops like asparagus, only the female plants produce the edible spears, but male plants are often preferred for higher yield.
Variants and Related Words
- Dioecy (n): The state or condition of being dioecious.
- Dioecy is less common in flowering plants than hermaphroditism.
- Monoecious (adj): Having both male and female reproductive organs on the same individual.
- Corn plants are monoecious, with separate male (tassel) and female (ear) flowers on the same stalk.
Synonyms
- Gonochoristic: A synonymous term used primarily in zoology for animals having separate sexes.
- Mammals are gonochoristic organisms.
Antonyms
- Monoecious: (For plants) Having both sexes on the same individual.
- Hermaphroditic: (For animals and some plants) Having both male and female reproductive organs in a single individual.
Adjective
-
having male and female reproductive organs in separate plants or animals
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