All the living organisms on the planet are basically divided into five kingdoms of which the ‘Kingdom Protista’ is one among them. Protista is nothing but a group of eukaryotic organisms which are mostly aquatic in nature and are found in the moist places. These organisms are usually unicellular and the cell of these organisms contain nucleus which is bound to organelles. Some of them even possess flagella or even cilia. They form a link between the plants, animals and the fungi.
‘Protista’ is a Greek word. These are the organisms that were traditionally considered as the first eukaryotic forms of living, main predecessors to the organisms in the plant, animal, and the fungus kingdoms.
Characteristics of Protista
The usual characteristics of Protista are given below-
- They are unicellular organisms, unlike the algae that are multicellular
- The cells of these species have a nucleus which is bound by organelles.
- They are autotrophic or certain ones are heterotrophic in nature which means that these organisms obtain their energy through the process of photosynthesis.
- There are also certain organisms that come under this kingdom which provides food and shelter to the aquatic species. For instance, Seaweed is one such kind.
- These are usually found in soil or moist areas.
Classification of Protista-
The kingdom Protista is divided into three types naming Protozoa, Algae, and Moulds.
Protozoans are unicellular organisms. These are also called as animal protists. They usually kill other organisms such as bacteria for the purpose of acquiring food. These are also parasitic organisms which live in the cells of other large organisms. They usually appear like jelly or spherical structures. Certain examples that come under this type include amoeba, paramecium, sporozoa, euglena etc.
Algae are another category of the kingdom Protista. These are generally single-celled or multi-cellular organisms. These are photosynthetic organisms that are mostly found in freshwater sources or marine lakes. They are characterized by a stiff cell wall. Usually, the algae are of six types namely green algae, brown algae, red algae, diatoms, pyrrophytes, and euglenoids. All of these exhibits a unique character among them. Few examples of Algae are Volvox, netrium, Spirogyra etc.
Molds- Molds are fungus or saprophytic organisms that live on the dead and the decaying matter. They are basically divided into two types viz. slime molds and the water molds. These are mainly the tiny organisms, which has many nuclei. These organisms obtain their food by feeding on other organisms. Usually, molds are characterized by the presence of spores and are even visible to naked eye. One of the examples of Molds includes Plasmodium.
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