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What do you think is meant by phrase,
“levels of organization?”
Levels of Organization
Hierarchy of Living Things
What meant by something arranged in
“hierarchical manner?”
Arranged in order of rank – smallest to largest.
Can you think of examples?
Levels of Organization
Living things is
characterized by
a hierarchy of
organization.
Each level of organization builds on the level
below it.
Emergent properties: new properties present at
one level that are not seen in the previous level
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Atom
• The most basic unit of matter (not actually living)
• Subatomic particles
Molecule
• Group of atoms held together by bonds
– Nucleus contains protons and neutrons
– Electrons orbit nucleus
Water – H2O
• Ex: An oxygen atom
(8 protons, 8 neutrons, 8 electrons)
DNA
Glucose
Protein
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Cell
Tissue
• The most basic unit of life
• Some organisms are unicellular (bacteria); others
are multicellular (plants, animals, fungi)
Organ
• Group of similar cells that perform a
specific function
Organ System
• A structure usually composed of several
tissue types that form a functional unit
leaf
• Two or more organs working together to perform
a specific function
heart
Ex: branch with stem, buds,
petioles, leaves
Organism
Ex: circulatory system with
heart, lungs, brain
Population
• Individual living
thing
• Members of one
species inhabiting
the same area
• Unicellular or
multicellular
Tree
Human
– Species: Group of
individuals that
can interbreed
and reproduce in
nature
Population of pine trees
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Community
Ecosystem
• Two or more populations of different
species living and interacting in the same
area
• A community together with its nonliving
surroundings
i.e. bear, pine trees, insects, ferns
i.e. pine trees, bear, insects (community) + rain, temperature, nutrients (non-living)
Biosphere
Levels of Organization
• Collection of
ALL
ecosystems on
Earth
Cellular Organization
cells
molecules
• Include all land,
water, and
atmosphere
atoms
The cell is the
basic unit of life.
• Both living and
non-living
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Levels of Organization
Levels of Organization
Organismal Level
Population Level
organism
ecosystem
community
organ systems
organs
tissues
species
population
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Levels of Biological Organization
We can see biological order in every organism in the
world, and we can find levels of organization from
the atoms to the largest living thing. The _______
are organized to form molecules, the __________ to
form cells, the ________ to form tissues, the
_________ to form organs, the _________ form
apparatuses and________, and these form the
whole called an _________, a group of individuals
that share the same genetic characteristics (one
species) forms a __________, a group of different
populations forms a __________, the communities
interact with their environment to constitute an
_________, and the sum of all ecosystems and
communities on Earth is the __________.
Levels of Biological Organization
We can see biological order in every organism in the
world, and we can find levels of organization from
Atom
the atoms to the largest living thing. The _______
Molecule
are organized to form molecules, the __________
to
Cells
form cells, the ________
to form tissues, the
Tissues
Organs
_________ to form organs, the _________ form
Organ systems and these form the
apparatuses and________,
whole called an _________,
a group of individuals
Organism
that share the same genetic characteristics (one
Populations a group of different
species) forms a __________,
Community
populations forms a __________,
the communities
interact with their environment to constitute an
Ecosystem and the sum of all ecosystems and
_________,
Biosphere
communities on Earth is the __________.
Levels of Organization - Foldable
• Directions:
– On one side of pyramid, write the
DESCRIPTION of each biological level
• i.e. Molecule = Different atoms bonded together
– On the third side of the pyramid, write 3
examples of each biological level
• I.e. Molecule = water (H2O), carbon dioxide (CO2),
carbohydrates
• Pg. 21 in book
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