Levels of Organization
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Transcript Levels of Organization
Levels of Organization
• Identify cells, tissues, organs, organ systems,
organisms, populations, communities, and
ecosystems as levels of organization in the
biosphere.
• ELIGIBLE CONTENT
• Identify the levels of organization in the
biosphere including cells, tissues, organs, and
organ systems,
• as well as organisms, populations, communities,
and ecosystems.
December 11, 2012
Aim: to identify and describe the levels
of organization in living things.
Homework: Bring in USB, dictionary,
highlighters, Draft 2 of HPV Vaccine Essay
with edits
Do Now: Name an organ system, organ,
and cell we’ve studied this year.
Notes: Levels of Organization
Levels of Organization
Cell—Basic unit of structure and function in organisms.
Some organisms, like bacteria and protists, are unicellular (made
entirely of one cell).
Some organisms, like fungi, plants, and animals, are multicellular
(made of many cells).
Bacteria have prokaryotic cells.
Protists, Fungi, Plants, and Animals have eukaryotic cells.
In multicellular organisms, cells exhibit cell specialization. They
take on specific jobs and look different from each other.
The cells also exhibit division of labor. They split up the work of
the organism.
Levels of Organization
• Tissues—Groups of similar cells that work
together to perform a specific function.
– 4 major tissue types in animals
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Epithelial tissue
Connective tissue
Muscle tissue
Nervous tissue
Levels of Organization
• Organs—structures made of different types of tissues
that work together to perform a specific function.
– Examples
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Heart
Lungs
Stomach
Small intestine
Liver
Large Intestine
Gall Bladder
Plant Roots
Plant Stems
Plant Leaves
Levels of Organization
• Organ Systems—Groups of organs that work
together to perform a specific function.
– Examples:
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Digestive system
Circulatory system
Respiratory system
Nervous system
Muscular system
Skeletal system
Integumentary system (skin)
Vascular system in plants
Levels of Organization
• Organism—A complete, individual living
thing.
• Examples:
– A single person
– A single plant
– A single bacterium
– A single protist
Questions
Which diagram below represents one type of human tissue?
Questions
Levels of Organization
• Population—Groups of organisms of the
same species (kind) that live together in a
particular area at a particular time.
– Examples: All the mice in Buckhorn
– All the people in New Market
– All the earthworms in your flower bed.
– All the roses in a rose garden.
– All the mushrooms (of a particular kind) in a
meadow.
Levels of Organization
• Community—All of the populations of
organisms that inhabit the same area at
the same time.
– Examples:
• All of the species of grasses, insects, shrubs, mice,
and bacteria that live in a particular field.
Levels of Organization
• Ecosystem—All of the communities of
organisms that inhabit an area as well as
all of the nonliving components of the area
that the organisms interact with.
(Communities + Environment).
– Examples:
• All of the trees, plants, and animals in a forest plus
all of the water, rocks, air, wind, etc…
Levels of Organization
• Biosphere—The region of Earth that
supports all life. All of the environments
and organisms on Earth.
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