ESS IB Test Review
ESS IB–
TestEnvironmental
Review
ESS IB–
TestEnvironmental
Systems
Review –
& Societies
Environmental
SystemsStudy
& Societies
Systems
Guide, Study
Practice
& Societies
Guide,
Questions
Study
Practice
&Guide,
Exam
Questions
Practice
Prep &
2026_2027.pdf
Exam
Questions
Prep &2026_2027.pdf
Exam Prep 2026_2027.pdf
ESS IB Test Review – Environmental Systems &
Societies Study Guide, Practice Questions & Exam
Prep 2026/2027
ESS IB Test Review
ESS IB–
TestEnvironmental
Review
ESS IB–
TestEnvironmental
Systems
Review –
& Societies
Environmental
SystemsStudy
& Societies
Systems
Guide, Study
Practice
& Societies
Guide,
Questions
Study
Practice
&Guide,
Exam
Questions
Practice
Prep &
2026_2027.pdf
Exam
Questions
Prep &2026_2027.pdf
Exam Prep 2026_2027.pdf
,ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Abiotic Factor
A non-living, physical factor that may influence an organism or ecosystem; i.e. temperature,
sunlight, pH, salinity, precipitation
Biochemical Oxygen Demand (BOD)
A measure of the amount of dissolved oxygen required to break down the organic material
in a given volume of water through aerobic biological activity
Biodegradable
Capable of being broken down by natural biological processes; i.e. the activities of
decomposer organisms
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
,ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Biodiversity
The amount of biological or living diversity per unit area. It includes the concepts of species
diversity, habitat diversity and genetic diversity.
Biomass/ Standing Crop
The mass of organic material in organisms or ecosystems, usually per unit area. Sometimes
the term "dry weight biomass" is used where mass is measured after the removal of water.
Water is not organic material and inorganic material is usually relatively insignificant in terms
of mass.
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
, ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Biome
A collection of ecosystems sharing similar climatic conditions; i.e. tundra, tropical rainforest,
desert.
Biosphere
That part of the Earth inhabited by organisms, that is, the narrow zone (a few km thick) in
which plants and animals exist. It extends from the upper part of the atmosphere (where
birds, insects and wind-blown pollen may be found) down to the deepest part of the Earth's
crust to which living organisms venture.
Biotic Factor
A living, biological factor that may influence an organism or ecosystem; i.e. predation,
parasitism, disease, competition.
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
ESS IB–
TestEnvironmental
Review
ESS IB–
TestEnvironmental
Systems
Review –
& Societies
Environmental
SystemsStudy
& Societies
Systems
Guide, Study
Practice
& Societies
Guide,
Questions
Study
Practice
&Guide,
Exam
Questions
Practice
Prep &
2026_2027.pdf
Exam
Questions
Prep &2026_2027.pdf
Exam Prep 2026_2027.pdf
ESS IB Test Review – Environmental Systems &
Societies Study Guide, Practice Questions & Exam
Prep 2026/2027
ESS IB Test Review
ESS IB–
TestEnvironmental
Review
ESS IB–
TestEnvironmental
Systems
Review –
& Societies
Environmental
SystemsStudy
& Societies
Systems
Guide, Study
Practice
& Societies
Guide,
Questions
Study
Practice
&Guide,
Exam
Questions
Practice
Prep &
2026_2027.pdf
Exam
Questions
Prep &2026_2027.pdf
Exam Prep 2026_2027.pdf
,ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Abiotic Factor
A non-living, physical factor that may influence an organism or ecosystem; i.e. temperature,
sunlight, pH, salinity, precipitation
Biochemical Oxygen Demand (BOD)
A measure of the amount of dissolved oxygen required to break down the organic material
in a given volume of water through aerobic biological activity
Biodegradable
Capable of being broken down by natural biological processes; i.e. the activities of
decomposer organisms
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
,ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Biodiversity
The amount of biological or living diversity per unit area. It includes the concepts of species
diversity, habitat diversity and genetic diversity.
Biomass/ Standing Crop
The mass of organic material in organisms or ecosystems, usually per unit area. Sometimes
the term "dry weight biomass" is used where mass is measured after the removal of water.
Water is not organic material and inorganic material is usually relatively insignificant in terms
of mass.
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
, ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
Biome
A collection of ecosystems sharing similar climatic conditions; i.e. tundra, tropical rainforest,
desert.
Biosphere
That part of the Earth inhabited by organisms, that is, the narrow zone (a few km thick) in
which plants and animals exist. It extends from the upper part of the atmosphere (where
birds, insects and wind-blown pollen may be found) down to the deepest part of the Earth's
crust to which living organisms venture.
Biotic Factor
A living, biological factor that may influence an organism or ecosystem; i.e. predation,
parasitism, disease, competition.
ESS IB Test Review.pdf ESS IB Test Review.pdf ESS IB Test Review.pdf
