Chapter 19 Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.

Chapter 19 Protists

19.1 DIVERSITY OF PROTISTS

Chapter 19 Protists Protists can be animal-like, plantlike, or funguslike.

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Protists:

Eukaryotes that are not animals, plants, or fungi – members of the Protista Kingdom – single celled or multicellular – microscopic or very large – reproduce asexually and/or sexually

Chapter 19 Protists Protists can be animal-like, plantlike, or funguslike.

• Protist are generally divided into three groups based on how they get their food: – Animal-like (consume other organisms) – Plantlike (make own food) – Funguslike (decompose other organisms)

Chapter 19 Protists

• Animal-like protists consume other organisms. – heterotrophs – single-celled – Not animals because animals are multicellular and animal like protist are single-celled

Chapter 19 Protists

• Plantlike protists are Make their own food through photosynthesis (autotroph). – single-celled, colonial (live together in colonies), or multicellular (kelp) – Not plants because they have no roots, stems, or leaves

Chapter 19 Protists

• Funguslike protists decompose dead organisms. – Heterotrophs. – can move at some point in their life cycle whereas fungi cannot.

Chapter 19 Protists

Chapter 19 Protists Protists are difficult to classify.

• Four of the six Kingdoms are Eukaryotes – Plant – Animal – Fungus – Protista

Difficult to classify because

 Many are only distantly related to each other.

 Many are more related to organisms in other kingdoms.

Chapter 19 Protists Protists are difficult to classify.

• Protista is often called the junk drawer of the kingdoms.

– Eukaryotes that do not fit into any other kingdom: - Animal like but not quite an animal - Plantlike but not quite a plant - Funguslike but not quite a fungus

Chapter 19 Protists

• Protist classification will likely change. – Some protists are not closely related.

– Molecular evidence supports reclassification.