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  1. Protoctista (definition): It is the fourth kingdom of nature as proposed by John Hogg. It consists of unicellular or primitive multicellular organisms that are not plants, animals, or fungi. They do not have much in common apart from a relatively simple organization.
    www.biologyonline.com/dictionary/protist
    Protoctista A kingdom consisting of unicellular or simple multicellular organisms that possess nuclei and cannot be classified as animals, plants, or fungi. Protoctists include the protozoa, algae, Dinomastigota, Oomycota, and slime moulds. Are protists and Protoctista the same?
    science-atlas.com/faq/what-is-protoctista-in-biology/
    Last Modified Date: August 25, 2023 Kingdom Protoctista is a biological classification for unicellular microorganisms with eukaryotic ancestry. Referencing eukaryotic ancestry simply means the organism is made up of eukaryotic cells: those cells that feature a nucleus and surrounding membrane.
    www.allthescience.org/what-is-the-kingdom-protoct…
    The term Protoctista replaces the term Protista, which connotes single-celled or acellular organisms, whereas the basal preplant (Protophyta) and preanimal (Protozoa) assemblages incorporated in Protoctista include many multicellular forms, because multicellularity appears to have evolved independently a number of times within these primitive groups.
    medical-dictionary.thefreedictionary.com/Protoctista

    Protists are a group of loosely connected, mostly unicellular eukaryotic organisms that are not plants, animals or fungi. There is no single feature such as evolutionary history or morphology common to all these organisms and they are unofficially placed under a separate kingdom called Protista.

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    Protoctista (definition): It is the fourth kingdom of nature as proposed by John Hogg. It consists of unicellular or primitive multicellular organisms that are not plants, animals, or fungi. They do not have much in common apart from a relatively simple organization.
    Related Biology Terms Protists are a group of loosely connected, mostly unicellular eukaryotic organisms that are not plants, animals or fungi. There is no single feature such as evolutionary history or morphology common to all these organisms and they are unofficially placed under a separate kingdom called Protista.
    Definition: any of a group of eukaryotic organisms belonging to the Kingdom Protista. What is a protist? All protists are eukaryotes, i.e. organisms with a nucleus. However, they are neither fungi nor plants. They are also not animals. They are a separate group of living things.
    The members of Protoctista were the primitive unicellular forms of both plants and animals. Later, the group “Protoctista ” was replaced by Ernst Haeckel. He coined the term “Protist”. This led to a classification system with three biological kingdoms: plants, animals, and protists.
    In 1860, British naturalist John Hogg proposed Protoctista (meaning 'first-created beings') as the name for a fourth kingdom of nature (the other kingdoms being Linnaeus ' plant, animal and mineral) which comprised all the lower, primitive organisms, including protophyta, protozoa and sponges, at the merging bases of the plant and animal kingdoms.
    en.wikipedia.org
    Not all protists are microscopic and single-celled; there exist some very large multicellular species, such as the kelps. During the past two decades, the field of molecular genetics has demonstrated that some protists are more related to animals, plants, or fungi than they are to other protists.
  3. WebMay 4, 2019 · Regina Bailey. Updated on May 04, 2019. The Kingdom Protista consists of eukaryotic protists. Members of this very diverse kingdom are typically unicelluar and less complex in structure than other …

  4. pro·tist
    noun
    biology
    1. a single-celled organism of the kingdom Protista, such as a protozoan or simple alga:
      "protists living in the surface layers of soil"
    More about protist
  5. WebFeb 2, 2023 · Protists are the oldest eukaryotic microorganisms, having a nucleus and other membrane-bound organelles. Since they do not wholly fit into other groups like plants, animals, bacteria, or fungi, they are …

  6. 13.3: Protists - Biology LibreTexts

  7. WebThe Protista, or Protoctista, are a kingdom of simple eukaryotic organisms, usually composed of a single cell or a colony of similar cells. Protists live in water, in moist terrestrial habitats, and as parasites and other symbionts …

  8. 19.1: Introduction to Protists - Biology LibreTexts