Levels of Biological Organization
Biosphere
Our entire planet Earth and all its living
inhabitants.
Ecosystem
Living things in a particular region and their
nonliving physical environment.
Community
• The living part of an ecosystem.
Population
• Group of individuals of a particular type that
live in the same area and actively interbreed
with one another.
Organism
• Independent individual.
Organ system
• Body part arranged to carry out a particular
general function within the organism.
Organ
• Group of tissues that perform specialized
function.
Tissue
• Group of similar cells.
Cell
• The simplest entity that has all the properties
of life.
Organelle
• Structure that performs specialized function
for the cell.
Molecule
• Clusters of atoms.
Atom
• The smallest unit of matter that still has
distinct chemical properties.
Subatomic particles
• Fundamental units of energy and matter.
All levels can be grouped in 3:
• Cellular
• Organismal
• Populational
Review
•
•
•
•
•
Clusters of atoms. (molecules)
Our entire planet earth. ( ? )
Independent individual. ( ? )
Group of similar cells. ( ? )
All of the various species living in the same
area. ( ? )
• Structure that performs specialized function
for the cell. ( ? )
Question 1
• Which of the following is defined as “the
living part of an ecosystem?”
• A. biosphere.
• B. community.
• C. organism.
• D. population.
• E. ecosystem.
Question 2
• Which of the following is defined as “group
of individuals of a particular type that live in
the same area and actively interbreed with
one another?”
• A. ecosystem.
• B. community.
• C. population.
• D. organism.
Answers
Question 1: B. community.
Question 2: C. population.