Levels of Levels of OrganizationOrganization

of Lifeof Life

Presentation based on one from http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

AtomMolecule

MacromoleculeOrganelle

CellTissueOrgan

SystemOrganismPopulationCommunity

EcosystemEcosphere

ATOMS• Smallest part of matter

• NON-living

Molecules • 2 or more bonded atoms

• Form compounds

• NON-living

Organic Organic molecules carbohydrates,

proteins, lipids and

nucleic acids.

Inorganic Inorganic molecules Water, Salts

Macromolecule• Very large molecules

•NON-living

Organelles• “Tiny organs”

• Made of macromolecules

Cell• Made of organelles

• Basic unit of structure & function

• LIVING

Tissue• The same kind cell working together

• Living

A A tissuetissue is a group of cells of similar is a group of cells of similar structure that perform a shared functionstructure that perform a shared function

Animal tissues:muscle

nervous

upper epidermal tissue

palisade mesophyll tissue

spongy mesophyll tissue

lower epidermal tissue

Tissues found in the leaf

Cross-section of a leaf

Slide taken from clickbiology.com

Organs• Tissues that work together

• Living

An An organorgan is a structure made of a group of tissues is a structure made of a group of tissues

working together to perform specific functionsworking together to perform specific functions

Plant organs include the stem and the leaves

heart

stomach

lungs liver

brain kidneys

Slide taken from clickbiology.com

An organ system is a group of organs that An organ system is a group of organs that coordinate to perform related functionscoordinate to perform related functions

lymphaticsystem

respiratorysystem

digestivesystem

excretory

system

reproductivesystem

muscularsystem

skeletalsystem

nervoussystem

endocrinesystem

circulatorysystem

Slide taken from clickbiology.com

Systems• Organs that work together

• Living

Organism• Entire living things (organisms)

• Usually made of systems

• May be a single cell

• Living

What type of organism is this?Unicellular or pluricellular?

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Population• Same type of organism living together

Community• Several populations living together

• Population interact

Ecosystem• A biotic (living) community plus the abiotic (nonliving) features

Ecosphere • Whole living layer around the globe

• Includes abiotic features (so all Ecosystems together)

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Can you write the levels of

organization of life?

Now, say an example ofNow, say an example ofAtom

MoleculeMacromolecule

OrganelleCell

TissueOrgan

SystemOrganismPopulationCommunity

EcosystemEcosphere

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