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Exploring the World of Protists: Diversity and Importance

Learn about the traits, classification, and significance of protists - from plant-like to pathogenic types, and their crucial roles in nature and human health.

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Exploring the World of Protists: Diversity and Importance

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  1. Protists

  2. What is a Protist? • Very diverse kingdom • Most are unicellular • Cells have membrane bound nucleus, some contain chloroplast

  3. Protists • Most reproduce asexually by binary fission • Some reproduce sexually • They like wet or moist surroundings.

  4. Classification of Protists • There are three kinds of protists: • PLANT-LIKE PROTISTS • ANIMAL-LIKE PROTISTS • FUNGI-LIKE PROTISTS

  5. Plantlike Protists • Contain chlorophyll for generating food in a process called photosynthesis • In periods of darkness cells can engulf food for nutrients • Example: Euglena

  6. Algae • Most are multi-cellular but do not form tissues • Contain chlorophyll that allow for photosynthesis • Includes sexual and asexual reproduction

  7. Animal Like Protists • Called “animal like” because they eat • Some engulf food, and some absorb nutrients directly through their cell membrane • Example: Amoeba, Paramecium and Sporazoan

  8. Amoeba • Amoeba’s feed by flowing around and engulf food particles • Amoeba reproduce by binary fission

  9. Paramecium • Uses hair-like structures called “cilia” to move around • Cilia can also be used to sweep food into the oral groove (mouth) • Usually reproduce by binary fission

  10. Sporazoan • No means of locomotion • Depends on host body fluids for movement • Ability to multiply asexually by forming spores

  11. Fungi Like Protists • Called “fungi like” because they are decomposers • 3 kinds: • Acellular Slime • Cellular Slime Moulds • Water Moulds

  12. Importance of Protists • Provides us with oxygen • Provides aquatic consumers with food • You have a protozoan living in your digestive tract right now, eating nutrients you do not need • Example:Trichomonas Hominis

  13. Pathogenic Protists • Example: Plasmodium • Causes Malaria • Carried by mosquitoes • Serious health problem throughout tropical areas of the world

  14. Pathogenic Protists • Example: Entamoeba Histolytica • Lives in human large intestine • Causes serious problems in the digestive tract • Sanitary disposal of human wastes is the best method of prevention

  15. Pathogenic Protists • Example: Trypanosoma • Transmitted by the Tsetse fly • Causes African Sleeping Sickness • Fever, chills, headache, skin irritation and disruption the sleep cycle

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