ESS IB Test Review UPDATED Exam Questions and CORRECT Answers
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Course
ESS IB
Institution
ESS IB
ESS IB Test Review UPDATED Exam
Questions and CORRECT Answers
Abiotic Factor - Correct Answer- A non-living, physical factor that may influence an
organism or ecosystem; i.e. temperature, sunlight, pH, salinity, precipitation
Biochemical Oxygen Demand (BOD) - Correct Answer- A measure of the ...
ESS IB Test Review UPDATED Exam
Questions and CORRECT Answers
Abiotic Factor - Correct Answer- A non-living, physical factor that may influence an
organism or ecosystem; i.e. temperature, sunlight, pH, salinity, precipitation
Biochemical Oxygen Demand (BOD) - Correct Answer- 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 - Correct Answer- Capable of being broken down by natural biological
processes; i.e. the activities of decomposer organisms
Biodiversity - Correct Answer- 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 - Correct Answer- 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.
Biome - Correct Answer- A collection of ecosystems sharing similar climatic conditions; i.e.
tundra, tropical rainforest, desert.
Biosphere - Correct Answer- 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 - Correct Answer- A living, biological factor that may influence an organism or
ecosystem; i.e. predation, parasitism, disease, competition.
Carrying Capacity - Correct Answer- The maximum number of species or "load" that can be
sustainably supported by a given environment.
, Climax Community - Correct Answer- A community of organisms that is more or less stable,
and that is in equilibrium with natural environmental conditions such as climate; the end
point of ecological succession.
Community - Correct Answer- A group of populations living and interacting with each other
in a common habitat.
Competition - Correct Answer- A common demand by 2 or more organisms upon limited
supply of a resource; i.e. food, water, light, space, mates, nesting sites. It may be intraspecific
or interspecific.
Correlation - Correct Answer- A measure of the association between 2 variables. If 2
variables tend to move up or down together, they are said to be positively correlated. If they
tend to move in opposite directions, they are said to be negatively correlated.
Crude Birth Rate - Correct Answer- The number of births per thousand individuals in a
population per year.
Crude Death Rate - Correct Answer- The number of deaths per thousand individuals in a
population per year.
Demographic Translation - Correct Answer- A general model describing the changing levels
of fertility and mortality in a human population over time. It was developed with reference to
the transition experienced as developed countries (i.e. those of North America, Europe,
Australia) passed through the processes of industrialization and urbanization.
Diversity - Correct Answer- A generic term for heterogeneity. The scientific meaning of the
diversity becomes clease from the context in which it is used; it may refer to heterogeneity of
species of habitat, or to genetic heterogeneity.
Genetic Diversity - Correct Answer- The range of genetic material present in a gene pool or
population of a species.
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