a
Which of the following is a biotic factor in an ecosystem?
a: temperature
b: sunlight
c: bacteria
d: water
bacteria
which organisms provide the original biological source of energy for consumers in most ecosystems
a: decomposes
b: producers
c: secondary consumers
d: detritivores
producers
producers contain 500,000 kcal of energy approximately how much energy would be available to secondary consumers
a:50,000 kcal
b:5,000 kcal
c:500 kcal
d:50 kcal
5,000 kcal
burning large amounts of fossil fuels directly increases the amount of which gas in the atmosphere
a:oxygen
b:carbon dioxide
c:nitrogen
d:hydrogen
carbon dioxide
which is a density independent limiting factor
a:competition
b:disease
c:predation
d:hurricane
hurricane
Which sequence correctly orders ecological organization from smallest to largest?
a: organism >population >community >ecosystem >biosphere
b: population >organism >ecosystem >community >biosphere
c: organism >community >population >biosphere >ecosystem
d: ecosystem >community >population >organism >biosphere
a: organism >population >community >ecosystem >biosphere
which organism is most likely an autotroph
a: mushroom
b: hawk
c: oak tree
d: grasshopper
oak tree
why is only a small percentage of energy transferred to the next tropic level
a: organisms destroy most energy
b: energy is used for life process and released as heat
c: producers prevent consumers from obtaining energy
d: decomposers absorb all unused energy
energy is used for life processes and released as heat
nitrogen fixation is important because it
a-converts nitrogen into forms organisms can use
b:removes all nitrogen from soil
c:producers carbon dioxide
d:prevents plants from absorbing nutrients
converts nitrogen into forms organisms can use
a rabbit population increases rapidly and exceeds the food supply what is most likely to happen next
a:the population will continue increasing indefinitely
b:the carrying will disappear
c:the population will likely decrease
d:food availability will automatically increase
the population will likely decrease
two species of birds rely on the same limited supply of seeds. which relationship is most likely occurring?
a: mutualism
b: competition
c: parasitism
d: commensalism
competition
consider the food chain grass >grasshopper >frog >snake >hawk which organism is the secondary consumer
a: grasshopper
b: frog
c: snake
d: hawk
frog
why are there generally fewer organisms at higher tropic levels
a: less energy is available to support them
b: they require less food
c: they reproduce faster
d: more sunlight reaches them
less energy is available to support them
which organisms play a major role in converting nitrogen compounds during the nitrogen cycle
a:bird
b:reptiles
c:bacteria
d:mammals
bacteria
primary succession is most likely to occur after
a:a forest fire that leaves the soil intactb:an abandoned farm field
c:a volcanic eruption that leaves bare rockd:a hurricane that damages vegetation
a volcanic eruption that leaves bare rock
a tick feeds on deer blood benefiting while harming the deer this is an example of
a: mutualism
b: predation
c: commensalism
d: parasitism
parasitism
in the same food chain the hawk would be classified as the
a: primary consumer
b: secondary consumer
c: tertiary consumerd: quaternary consumer
quaternary consumer
which statement correctly compares energy and matter in ecosystems
a: both energy and matter are continuously recycled
b: energy cycles while matter flows in one direction
c: energy flows through ecosystems while matter is recycled
d: neither energy nor matter moves between organisms
energy cycles while matter flows in one direction
a population has reached carrying capacity when
a-every individual leaves the ecosystem
b-the environment can no longer sustainably support additional population growth
c-predators have been eliminated
d-unlimited resources become available
the environment can no longer sustainably support additional population growth
which organisms are commonly pioneer species during primary succession
a:large trees
b:hawks
c:lichens
d:deer
lichens
bees obtain nectar from flowers while helping the flowers reproduce through pollination this relationship is
a: competition
b: mutualism
c: parasitism
d: predation
mutualism
what happens to available energy as it moves from one tropic level to the next
a: it increases by 90%
b: it remains constant
c: approximately 10% is transferred
d: all energy is transferred
approximately 10% is transferred
which process removes carbon dioxide from the atmosphere
a:celluar respiration
b:combustion
c:photosynthesis
d:decomposition
photosynthesis
which is a density dependent limiting factor
a-hurricane
b-wildfire
c-competition
d-drought
competition
secondary succession usually occurs faster than primary succession because
a:secondary succession begins with existing soil
b:secondary succession has no organisms
c:primary succession begins with mature trees
d:primary succession receives less sunlight
secondary succession begins with existing soil