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WorksheetsBiology SB5
Total questions: 21
Worksheet time: 46mins
The picture below shows a mimosa leaf before and after it was pinched.
It is moving away from the pull of gravity.
It is moving away from touch.
It is moving toward touch.
It is moving toward light.
Food Availability, Places to live, and water availability are all ______ of an Ecosystem.
Biotic factors
Heterotrophic factors
limiting Factors
Population factors
The image shown is of a kelp bed. In ideal conditions, kelp can grow up to 18 inches per
day. In stark contrast to the slow-growing corals, the giant kelp canopies tower above the
ocean floor. Like trees in a forest, these giant algae provide food and shelter for thousands
of fish, invertebrates, and marine mammal species. Storms and weather events, like El
Niño, can tear and dislodge the kelp, leaving a tattered forest to begin its growth again
each spring. Sea otters and sea urchins play critical roles in the stable equilibrium of this
ecosystem. Sea urchins graze kelp and may reach population densities large enough to
destroy kelp forests at the rate of 30 feet per month. Urchins move in herds, and enough
urchins may remain in the location of a former kelp forest to stop any regrowth.
In the scenario above, identify the keystone and foundation species. Infer what might
happen if the keystone species were greatly reduced.
Keystone species is the kelp. If the kelp is reduced or destroyed the basis for the entire
ecosystem is destroyed as is the ecosystem.
Keystone species is the kelp. It is the foundation for this ecosystem. If destroyed it would
be replaced by another producer to establish a different ecosystem.
Keystone species is the sea otter. Sea otters, playing a critical role in containing the
urchin populations, prey on urchins and thus control the numbers of kelp grazers to
maintain the forest.
Keystone species is the sea urchin. If the sea urchin species is greatly reduced by an
increase in the sea otter population, the kelp beds would continue to grow unchecked and
other populations of herbivores would grow.
The population of mice in a local forest ecosystem has recently died out due to disease. In
the past, these mice were the main predators of the forest beetles.
What is the best prediction about what will happen to the beetles?
The drop in the mouse population will lead to a drop in the beetle population.
The drop in the mouse population will lead to no change in the beetle population.
The drop in the mouse population will lead to an increase in the beetle population.
The increase in the mouse population will lead to an increase in the beetle population.
When the members of a population reproduce at a constant rate and overshoot the
carrying capacity of their environment, it is called _______________ growth.
logistic
demographic
exponential
density dependent
In an ecosystem, which is NOT a density-dependent limiting factor?
predation
parasitism
competition
natural disaster
Choose the letter than correctly answers the question.
Which of the these is shown from the smallest to the largest?
organism, population, community, ecosystem, biosphere
biosphere, ecosystem, community, population, organism
population, ecosystem, community, organism, biosphere
community, ecosystem, biosphere, population, organism
Which of the following statements describes density-independent limiting factors?
Competition is an example.
Environmental extremes, such as a hurricane or drought, are examples.
Their effects increase as the population increases in an area.
The drawings below show a young sunflower plant at different times of the day.
Which of the following describes the plant's movement?
It bends away from the pull of gravity.
It bends away from light.
It bends toward light.
It bends toward water.
Which of the following statements on ecosystem stability is correct?
Higher biodiversity in an ecosystem provides better stability.
Multiple keystone species are important to ecological stability.
Ocean ecosystems are far more stable than terrestrial ecosystems.
Higher animal to plant ratios provides the most stable environment.
What is a group of individual organisms that belong to the same species?
Community
Ecosystem
Biome
Population
Some birds are known as honeyguides because humans often follow them to wild beehives. When the humans take the honey from the hives, the birds are able to feast on
the honey and the bees as well. This type of relationship between the humans and the birds can best be described as
Mutualism
Commensalism
Parasitism
Herbivory
If two species of organisms occupy the same niche ____________
one will find a new habitat.
competition will be very intense.
both organisms will become extinct.
both will need to enlarge their habitat.
What impact do the amounts of available energy, water, and oxygen have on an
ecosystem?
They are used as nutrients by living organisms.
They recycle the residue of dead organisms.
They control the environment's energy source.
They act as limiting factors on the organisms.
What do tropisms NOT allow a plant to do?
respond to light
respond to gravity
respond to water sources
respond to sound
Look at the image
gravitropism
phototropism
thigmotropism
rapid response
Alligators will use their powerful feet, tail, and snouts to dig a hole through the mud, producing small ponds known as "alligator holes." Many other species benefit from
alligator holes. During the dry season, fish, turtles, and other aquatic animals live in the alligator holes. Birds, terrestrial animals, and plants use these holes as a source of water. What term best describes the role of alligators in this ecosystem?
invasive exotic species
keystone species
producer
primary consumer
Which is NOT an abiotic limiting factor?
too much water
too high temperature
insufficient nutrients
population overcrowding
Which of the following is an example of a density-dependent limiting factor?
temperature
predation
oxygen supply
an earthquake
A graph representing a population growth curve is shown
What does B represent on this growth curve?
a population's carrying capacity
exponential growth within a population
linear growth within a population
the lag phase of a population's growth
The graph shows the population growth of a colony of insects over time.
Which statement below best explains what might have occurred to the population of insects at point A?
The health of the insects improved, causing the population to stabilize.
A predator was introduced, causing a decline in population growth.
The population growth decreased as individual insects aged.
The population reached a carrying capacity and stabilized.
