Transcript Biology Slide 1 of 13 Copyright Pearson Prentice Hall End Show 20-1 The Kingdom Protista Slide 2 of 13 Copyright Pearson Prentice Hall End Show.

Biology
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20-1 The Kingdom Protista
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20-1 The Kingdom Protista
What Is a Protist?
What Is a Protist?
What are protists?
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20-1 The Kingdom Protista
What Is a Protist?
Protists are eukaryotes that are not
members of the Plant, Animal, or Fungi
kingdoms.
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20-1 The Kingdom Protista
What Is a Protist?
The kingdom Protista may include more than 200,000
species.
Most, but not all, protists are unicellular.
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20-1 The Kingdom Protista
Evolution of Protists
Evolution of Protists
The first eukaryotic organisms on Earth were
protists.
Mitochondria and chloroplasts in eukaryotic cells
may have descended from prokaryotes that lived
inside larger cells.
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20-1 The Kingdom Protista
Classification of Protists
Classification of Protists
One way protists can be classified is by how they
obtain nutrition:
• Heterotrophs are called animal-like protists.
• Photosynthesizers are called plantlike protists.
• Decomposers and parasites are called
funguslike protists.
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A protist is any organism that is not a plant, an
animal, a fungus, or a prokaryote.
a. True
b. False
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Funguslike protists are
a. autotrophic.
b. photosynthetic.
c. parasitic.
d. chemosynthetic.
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Animal-like protists are
a. autotrophs.
b. heterotrophs.
c. decomposers.
d. producers.
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Biologists have difficulties classifying protists
because
a. their DNA cannot be examined.
b. evidence suggests that they evolved from so
many different groups.
c. structural similarities used for classification
are difficult to detect.
d. their ancestors may have evolved through
symbiosis.
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An organism is classified as a protist if it
a. resembles any other member of the Eukarya
domain.
b. shares DNA sequences that are found only
in other protists.
c. has a cell wall made of cellulose.
d. does not belong in any other kingdom of the
Eukarya.
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