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KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.

Explore the fascinating world of Protista, the most diverse kingdom, including animal-like protozoans, plant-like algae, and fungus-like decomposers. Learn about the origins of multicellularity and the impact of protists on ecosystems. Discover diseases caused by animal-like protists and the crucial role of plant-like protists in photosynthesis.

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KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.

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  1. KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.

  2. Protists are eukaryotes that are not animals, plants, or fungi. Protists can be animal-like, plant-like, or fungus-like.

  3. Animal-like protists consume other organisms. aka: protozoans • heterotrophs • single-celled • Some examples include: • Pseudopods, flagellates, cilliates

  4. Animal-Like Protista & Disease • Malaria: Infected mosquito bites • Fever, vomiting, coma, death • Sleeping sickness: bite of tsetse flies • Coma & death

  5. Plant-like protists are photosynthetic. Aka: Algae • no roots, stems, or leaves • Perform photosynthesis with chloroplasts • (seaweed, kelp) • Example: Diatoms • Glasslike shells • Provide ~ ½ O2 on Earth

  6. Live in 3 arrangements 1) Single-celled 2) Multicellular colonies; independent acting cells Over time, cells became somewhat specialized 3) Multicellular colonies; specialized cells Over time, cells dependent on others because of specialization Beginning of multicellular life??? Origins of Multicellularity

  7. Fungus-like protists decompose dead organisms. • heterotrophs • can move, whereas fungi cannot (spores develop cilia) • Some examples include: • Slime molds: very large (~1m) single celled mass of cytoplasm. • Water molds: can be parasitic, like the Potato Blight (disease that caused the potato famine in Ireland)

  8. Protists are difficult to classify. • Protista is one kingdom in the domain Eukarya. • Protista classification will likely change. • Some protists are not closely related. • Molecular evidence supports reclassification.

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