Protists space a diverse group of eukaryotic organisms belonging to Kingdom Protista. There are couple of similarities in between individual members of this Kingdom, together it contains all the eukaryotes that room not animals, plants, or fungi.

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Most protists room microscopic and also unicellular, despite a couple of species room multicellular. Typically, protists reproduce asexually, though part are capable of sex-related reproduction. Part protists space heterotrophs, and feed on other microscopic organisms and carbon-rich products they discover in their surrounding environment; others room photosynthetic and make their own food using chloroplasts.

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Protists may be classified as animal-like, fungus-like, or plant-like

Classification of Protists


Protists are always eukaryotic, and all protists contain a nucleus and other membrane-bound organelles. They are typically unicellular organisms, though a couple of are multicellular. Protists live in aquatic environments and also may be discovered in freshwater, saltwater, or damp floor habitats.

Besides these features, the members the Kingdom Protista have small in common with one another. Protists come in a wide variety of different forms and may be classified as animal-like, plant-like, or fungus-like, depending upon their characteristics.

Animal-like Protists

Animal-like protists space calledprotozoa(meaning ‘first animal’). Every protozoans room unicellular and also heterotrophic, an interpretation they look for out food in their surrounding environments. Part animal-like protists prey on other, smaller sized microorganisms, which castle engulf and also digest in a process known asphagocytosis.Others might feed top top non-living, necessary matter.Many protozoa have actually a mouthlike structurethrough i m sorry they deserve to ingest food particles, while part absorb nutrients through their cell membrane.


Protozoa commonly have digestive secret but, unlike other species of protists, they nothing contain chloroplasts. Animal-like protists also lack a cabinet wall.

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Animal-like protists are referred to as protozoa

Examples the Animal-like Protists

There are four main types of animal-like protists; these space the amoeba, the flagellates, the ciliates, and the sporozoans.

Amoeboid Protozoans

Amoeba are identified by the visibility of pseudopodia, or ‘false feet,’ which they usage to catch bacteria and also smaller protists.

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Amoeba have pseudopods (AKA ‘false feet’)

Flagellated Protozoans

Flagellates haveflagella,whip, or tail-like frameworks which they use to propel themselves with water. Part flagellates are parasitic, if others space free-living.

Ciliated Protozoans

Ciliates are covered incilia,tiny hair-like frameworks which they usage to relocate around and also waft food into their mouths.

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Ciliates space covered in tiny, hair-like structures

Sporozoans

Sporozoans room parasitic organisms. One famous example isPlasmodium,the parasite known to cause malaria.

Fungus-like Protists

Fungus-like protists are well-known asmolds.Like true fungi, they are heterotrophic feeders and absorb nutrients from disk organic matter in your environment. They additionally reproduce utilizing spores. However, they differ from true fungi in the their cell walls contain cellulose, quite than chitin.

Examples the Fungus-like Protists

The two major types the fungi-like protists are slime molds and also water molds.

Slime Molds

Slime molds are often found on rotting logs, whereby they feeding on decaying necessary matter. This molds are regularly unicellular but, when food is scarce, have the right to swarm together to kind a slimy mass. These brightly fancy blobs can move very slowly in their search for food and, in part cases, can fuse to form one enormous, multinucleated cell.

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Slime molds can type multicellular structures

Water Molds

Water molds usually live ~ above the surface of water, or in damp soil and, favor slime molds, feed on decaying organic matter. This group consists of several plant pathogens, including the devastating potato condition known as potato blight.

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Some fungus-like protists reason serious tree diseases

Plant-like Protists


Plant-like protists (AKAalgae) space usually photosynthesis organisms, and most contain chloroplasts and/or chlorophyll. Algal cells usually have a cell wall surface which, favor the cell walls of true plants, contain cellulose. However, uneven true plants, algae absence leaves, stems, and also roots. Plant-like protists might reproduce asexually or sexually.

Most algal types are unicellular, though some kind large, multicellular frameworks (for example,seaweeds). Plant-like protists live in aquatic environments and also most types are discovered in oceans, lakes, and also ponds.

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Plant-like protists are referred to as algae

Examples of Plant-like Protists

The 7 major groups the algae room red algae, environment-friendly algae, brown algae, fire algae, golden-brown algae, yellow-green algae, and also euglenids.

Red Algae

Red birds are typically found in tropical marine atmospheres where they often thrive on level surfaces, such as reefs. Despite red algae may be unicellular, castle are frequently multicellular organisms and kind a selection of seaweeds.

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Red algae can be multicell seaweeds

Green Algae

Green algae space the most abundant team of algae. Castle contain chloroplasts and cell walls and are assumed to it is in the evolution ancestors of floor plants. Environment-friendly algae might be unicellular or multicellular.

Brown Algae

Brown algae are frequently found in maritime environments. They space multicellular organisms and form a range of plant-like species. The biggest known example of brown algae is the giant kelp, which often grows to over 30m in length.

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Giant kelp is the largest varieties of naval algae

Fire Algae

Fire algae include a group of unicellular organisms called thedinoflagellates.Some dinoflagellates arebioluminescentand deserve to light increase the surface ar of the s with an eerie, night-time glow. When existing in large numbers, dinoflagellates can likewise cause a phenomenon well-known as ‘red tide.’

Golden-brown Algae and also Diatoms

Golden-brown algae have the right to be discovered in both marine and also freshwater environments. This group has thediatoms,photosynthetic organisms through transparent cell wall surfaces made the silica. Many types of marine plankton are diatoms.

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Many varieties of maritime plankton are diatoms

Yellow-green Algae

Yellow-green algae room photosynthetic organisms that live mostly in freshwater environments. Countless have a cell wall surface that does no contain cellulose (as in plants and also algae) or chitin (like fungi and molds). The cell wall surface composition the yellow-green algae isalmost totally unknown.

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Euglenids

Euglena space photosynthetic birds that are found in a selection of aquatic habitats. Euglenids generally have one or more flagella yet lack a cabinet wall, and also are instead encased by a protein-rich structure referred to as apellicle.