The Six Kingdoms of Living Things

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The Six KingdomsofLiving Things
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How many different organisms are there on earth?

• The latest estimate by scientists is that there
  are 8.7 million different species on earth!
• But, some scientists think this estimate is way
  too low.
• The truth is we really dont know, but we do know
  there are millions of different species.

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That is why we classify.

• Because there are so many different kinds of
  living things, scientists have classified them
  and grouped them by their characteristics. This
  makes it easier to study them. Every living thing
  belongs to one of the six kingdoms of living
  things.

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The Six Kingdoms

1. Archaebacteria
2. Eubacteria
3. Protista
4. Fungi
5. Plantae
6. Animalia

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Three characteristics determine how to classify
an organism into a kingdom.
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1. How many cells make up the body of the
organism?

• An organism that is made up of only one cell is
  called a UNICELLULAR organism.
• An organism which is made up of more than one
  cell is called a MULTICELLULAR organism.

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2. Does the organism have a nucleus?

• An organism that has a nucleus is called a
  EUKARYOTE.
• An organism that does not have a nucleus is
  called a PROKARYOTE.

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3. How does the organism get its food?

• Organisms which make their own food are called
  AUTOTROPHIC.
• Organisms that must take in food are called
  HETEROTROPHIC.

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Archaebacteria

• Archaebacteria are unicellular.
• They are prokaryotes.
• Some are autotrophic and some are heterotrophic.
• They are often found in extreme conditions, such
  as hot springs.

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Eubacteria

• Eubacteria are unicellular.
• They are prokaryotes.
• Some are autotrophic and some are heterotrophic.
• This is the larger of the two bacteria kingdoms
  and they dont live in extreme conditions.

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Protists

• Some protists are unicellular and some are
  multicellular.
• All protists are eukaryotes.
• Some of them are autotrophic and some are
  heterotrophic
• They are divided into three groups-plantlike,
  animal-like, and funguslike. This is the
  odds-and-ends kingdom.

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Fungi

• Most fungi are multicelluar. One exception is
  yeast. Yeast are unicellular.
• All fungi are eukaryotes.
• All fungi are heterotrophic.
• Fungi are important sources of food (yeast and
  mushrooms) and they help recycle Earths wastes
  (decomposers).

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Plants

• All plants are multicellular.
• All plants are eukaryotes.
• All plants are autotrophic.
• Plants produce food and oxygen, which are
  required by most organisms on Earth.

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Animals

• All animals are multicellular.
• All animals are eukaryotes.
• All animals are heterotrophic.
• Animals provide food and companionship in your
  daily lives.

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