Levels of Biological OrganizationLevels of Biological Organization

BiosphereBiosphere

Our entire planet Earth and all its living Our entire planet Earth and all its living inhabitants.inhabitants.

EcosystemEcosystem

Living things in a particular region and their Living things in a particular region and their nonlivingnonliving physical environment.physical environment.

CommunityCommunity

• The living part of an ecosystem.The living part of an ecosystem.

PopulationPopulation

• Group of individuals of a particular type that Group of individuals of a particular type that live in the same area and actively interbreed live in the same area and actively interbreed with one another.with one another.

OrganismOrganism

• Independent individual.Independent individual.

Organ systemOrgan system

• Body part arranged to carry out a particular Body part arranged to carry out a particular general function within the organism.general function within the organism.

OrganOrgan

• Group of tissues that perform specialized Group of tissues that perform specialized function.function.

TissueTissue

• Group of similar cells.Group of similar cells.

CellCell

• The simplest entity that has all the The simplest entity that has all the properties of life.properties of life.

OrganelleOrganelle

• Structure that performs specialized function Structure that performs specialized function for the cell.for the cell.

MoleculeMolecule

• Clusters of atoms.Clusters of atoms.

AtomAtom

• The smallest unit of matter that still has The smallest unit of matter that still has distinct chemical properties.distinct chemical properties.

Subatomic particlesSubatomic particles

• Fundamental units of energy and matter.Fundamental units of energy and matter.

All levels can be grouped in 3:All levels can be grouped in 3:

• CellularCellular

• OrganismalOrganismal

• PopulationalPopulational

ReviewReview

• Clusters of atoms. Clusters of atoms. ((molecules)molecules)• Our entire planet earth. ( ? )Our entire planet earth. ( ? )• Independent individual. ( ? )Independent individual. ( ? )• Group of similar cells. ( ? )Group of similar cells. ( ? )• All of the various species living in the same All of the various species living in the same

area. ( ? )area. ( ? )• Structure that performs specialized function Structure that performs specialized function

for the cell. ( ? )for the cell. ( ? )

Question 1Question 1

• Which of the following is defined as “the Which of the following is defined as “the living part of an ecosystem?”living part of an ecosystem?”

• A. biosphere.A. biosphere.

• B. community.B. community.

• C. organism.C. organism.

• D. population.D. population.

• E. ecosystem.E. ecosystem.

Question 2Question 2

• Which of the following is defined as “group Which of the following is defined as “group of individuals of a particular type that live in of individuals of a particular type that live in the same area and actively interbreed with one the same area and actively interbreed with one another?”another?”

• A. ecosystem.A. ecosystem.• B. community.B. community.• C. population.C. population.• D. organism.D. organism.

AnswersAnswers

Question 1: Question 1: B. community.B. community.

Question 2: Question 2: C. population.C. population.