What are Protists?
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Questions and Answers

What is the primary characteristic of all protists?

  • They are found only in aquatic environments
  • They are multicellular organisms
  • They are eukaryotic organisms (correct)
  • They are autotrophic in nature

    • What is the origin of the term 'Protista'?

  • From the German word 'protist', meaning 'ancient organism'
  • From the Latin word 'protista', meaning 'simple organism'
  • From the Greek word 'protistos', meaning 'the very first' (correct)
  • From the French word 'protiste', meaning 'primitive organism'

    • What is the nature of the cell of protist organisms?

  • The cell has no nucleus but has organelles
  • The cell has a nucleus but no organelles
  • The cell has a nucleus and membrane-bound organelles (correct)
  • The cell lacks a nucleus and organelles

    • What is the significance of protists in the evolutionary history of life on Earth?

    <p>They form a link between plants, animals, and fungi</p> Signup and view all the answers

    What is a characteristic of the nutrition of protists?

    <p>They can be either autotrophic or heterotrophic in nature</p> Signup and view all the answers

    What is the primary function of pseudopodia in amoeboid protozoans?

    <p>To change their shape and capture food</p> Signup and view all the answers

    What is unique about euglena compared to other protozoans?

    <p>It has chlorophyll and can make its own food</p> Signup and view all the answers

    What is the primary mode of reproduction in protozoans?

    <p>Asexual reproduction</p> Signup and view all the answers

    What is an example of a symbiotic relationship involving kelp?

    <p>Kelp and otters</p> Signup and view all the answers

    What is the function of contractile vacuoles in amoebas?

    <p>To pump water in or out of the cell</p> Signup and view all the answers

    Study Notes

    What are Protists?

    • Protists are simple eukaryotic organisms that are neither plants, animals, nor fungi.
    • They are unicellular in nature but can also be found as a colony of cells.
    • Most protists live in water, damp terrestrial environments, or as parasites.

    Characteristics of Kingdom Protista

    • The primary feature of all protists is that they are eukaryotic organisms with a membrane-enclosed nucleus.
    • Other characteristic features of Kingdom Protista include:
      • Being usually aquatic, present in soil, or in areas with moisture.
      • Being unicellular organisms, but with a few multicellular protists (e.g., kelp).
      • Having a nucleus and membrane-bound organelles in their cells.
      • Being autotrophic or heterotrophic in nature.
      • Exhibiting symbiosis, parasitism, and locomotion through cilia, flagella, or pseudopodia.
      • Reproducing by asexual means, with rare instances of sexual reproduction during times of stress.

    Classification of Protista

    • Kingdom Protista is classified into several groups, including:
      • Protozoa: unicellular organisms that are heterotrophic and exhibit animal-like behaviors.
      • Examples of protozoans include amoeba, paramecium, and euglena.
      • Subgroups of protozoans:
        • Amoeboid protozoans (e.g., amoeba): characterized by pseudopodia and found in water bodies.
        • Flagellated protozoans: characterized by flagella and found in various environments.
        • Sporozoa: parasitic protozoans that infect animals and humans.
        • Ciliophora: protozoans with cilia, such as paramecium.

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    Description

    Learn about Protists, simple eukaryotic organisms that are neither plants, animals, nor fungi, and their characteristics, habitats, and unique features.

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