Levels of Organization & Relationships (2.1)
State Standard
SB4A. Investigate the relationships among
organisms, populations, communities,
ecosystems, and biomes.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Ecology
 Scientific discipline in which the
________________ among living
organisms and the interaction the
organisms have with their
_______________ are studied.
 Ecologists ______________,
_____________, and ____________ using
a variety of tools and methods.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
The Biosphere
 A ______________ layer around Earth.
 Extends several kilometers
______________ the Earth’s surface.
 Extends several kilometers
_______________ the ocean’s surface.
 The term biosphere includes all organisms
and the environments in which they live
(___________ and ___________ factors).
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Biotic Factors
 _______________ factors in an organism’s
environment.
Abiotic Factors
 ________________ factors in an organism’s
environment.
 Organisms ____________ to survive in the
abiotic factors present in their
_____________ environment.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Levels of Organization
 Levels _______ in complexity as the _________
and ___________ between organisms increase.
 Organism - Individuals
 Population - includes all the ____________ in the same species in a
given area.
 Community -
a collection of __________ that interact with each other
in a given area.
 Ecosystem - includes all biotic and abiotic __________in a given area.
 Biome – A group of ____________in the same region having similar types
of vegetation governed by similar climate conditions.
 Biosphere – all organisms and the ______________ in which they live.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
 The ______________ level of organization
is the individual organism itself.
 Organisms of a single species that share
the same geographic location at the same
time make up a ____________.
 A _______________ is a group of interacting
populations that occupy the same geographic
area at the same time.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
 An ___________is a biological community
and all of the abiotic factors that affect it.
 A __________ is a large group of
ecosystems that share the same climate and
have similar types of communities.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Ecosystem Interactions
 A ____________ is an area where an
organism lives.
 A ____________ is the role or position that
an organism has in its environment.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Community Interactions
 Competition
 Occurs when more than one organism
uses a resource at the __________ time
 ____________
 Many species get their food by eating
other organisms.
Chapter 2
Principles of Ecology
2.1 Organisms and Their Relationships
Symbiotic Relationships
 The close relationship that exists when
two or more species live together
 _______________
 _______________
 _______________
- ________ organisms benefit
- One benefits while the other is
____________
- One benefits while the other is
____________
Clown Fish & Sea Anemone
Bee & Flowering Plant
Mutualism
Bristle Worm
Hermit Crab
Commensalism
Wasp Larvae & Tomato Hornworm
Tick & Human
Parasitism