Protista
Protista
Protista (pronunciation: pro-tis-ta) is a taxonomic group of eukaryotic organisms, typically single-celled and microscopic in nature. The term "Protista" was first used by Ernst Haeckel in 1866, derived from the Greek word "protistos" meaning "the very first".
Etymology
The term "Protista" comes from the Greek "protistos", meaning "the very first". This reflects the belief, prevalent at the time of the term's coinage, that protists represented the first form of life to evolve on Earth.
Definition
Protists are a diverse group of organisms that are not classified as plants, animals, or fungi. They are usually single-celled and microscopic in size, but some are multicellular. Protists include a variety of organisms, such as algae, amoebas, and slime molds.
Classification
Protists were traditionally subdivided into several groups based on similarities to the "higher" kingdoms: the plant-like algae, the animal-like protozoans, and the fungus-like slime molds. However, modern classification efforts aim to group protists based on their evolutionary relationships.
Characteristics
Protists are incredibly diverse in their structures and functions. They can be heterotrophic, obtaining their nutrients from organic materials, or autotrophic, producing their own food through photosynthesis. Some protists are parasitic, causing diseases in humans and other animals.
Related Terms
- Eukaryote: An organism whose cells contain a nucleus and other structures (organelles) enclosed within membranes.
- Algae: A diverse group of photosynthetic organisms that are not classified as plants. They are a major component of the protists.
- Protozoan: Single-celled, heterotrophic protists that feed on organic matter.
- Slime Mold: A type of protist that resembles a fungus in that it uses spores to reproduce.
External links
- Medical encyclopedia article on Protista
- Wikipedia's article - Protista
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