UPDATED ACTUAL Exam Questions and
CORRECT Answers
autotroph - CORRECT ANSWER- ✔✔organism that can capture energy from sunlight or
chemicals and use it to produce its own food from inorganic compounds; also called a
producer
biosphere - CORRECT ANSWER- ✔✔part of Earth in which life exists including land,
water, and air or atmosphere
community - CORRECT ANSWER- ✔✔assemblage of different populations that live
together in a defined area
consumer - CORRECT ANSWER- ✔✔organism that relies on other organisms for its energy
and food supply; also called a heterotroph
ecology - CORRECT ANSWER- ✔✔scientific study of interactions among organisms and
between organisms and their environment
ecosystem - CORRECT ANSWER- ✔✔collection of all the organisms that live in a particular
place, together with their nonliving environment
food chain - CORRECT ANSWER- ✔✔series of steps in an ecosystem in which organisms
transfer energy by eating and being eaten
food web - CORRECT ANSWER- ✔✔network of complex interactions formed by the
feeding relationships among the various organisms in an ecosystem
heterotroph - CORRECT ANSWER- ✔✔organism that obtains energy from the foods it
consumes; also called a consumer
,population - CORRECT ANSWER- ✔✔group of individuals of the same species that live in
the same area
producer - CORRECT ANSWER- ✔✔organism that can capture energy from sunlight or
chemicals and use it to produce food from inorganic compounds; also called an autotroph
species - CORRECT ANSWER- ✔✔group of similar organisms that can breed and produce
fertile offspring
trophic level - CORRECT ANSWER- ✔✔step in a food chain or food web
abiotic factors - CORRECT ANSWER- ✔✔physical, or nonliving, factor that shapes an
ecosystem
biotic factors - CORRECT ANSWER- ✔✔biological influence on organisms within an
ecosystem
commensalisms - CORRECT ANSWER- ✔✔symbiotic relationship in which one member of
the association benefits and the other is neither helped nor harmed
mutalism - CORRECT ANSWER- ✔✔symbiotic relationship in which both species benefit
from the relationship
niche - CORRECT ANSWER- ✔✔full range of physical and biological conditions in which
an organism lives and the way in which the organism uses those conditions
predation - CORRECT ANSWER- ✔✔interaction in which one organism captures and feeds
on another organism
parasitism - CORRECT ANSWER- ✔✔symbiotic relationship in which one organism lives in
or on another organism (the host) and consequently harms it
, pioneer species - CORRECT ANSWER- ✔✔first species to populate an area during primary
succession
primary succession - CORRECT ANSWER- ✔✔succession that occurs on surfaces where no
soil exists
symbiosis - CORRECT ANSWER- ✔✔relationship in which two species live closely
together
carrying capacity - CORRECT ANSWER- ✔✔largest number of individuals of a population
that a given environment can support
emigration - CORRECT ANSWER- ✔✔movement of individuals out of an area
exponential growth - CORRECT ANSWER- ✔✔growth pattern in which the individuals in a
population reproduce at a constant rate
immigration - CORRECT ANSWER- ✔✔movement of individuals into an area occupied by
an existing population
logistic growth - CORRECT ANSWER- ✔✔growth pattern in which a population's growth
rate slows or stops following a period of exponential growth
population density - CORRECT ANSWER- ✔✔number of individuals per unit of area
gene pool - CORRECT ANSWER- ✔✔combined genetic information of all the members of a
particular population
genetic drift - CORRECT ANSWER- ✔✔random change in allele frequencies that occurs in
small populations
genetic equilibrium - CORRECT ANSWER- ✔✔situation in which allele frequencies remain
constant