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WorksheetsEcosystem Assessment #2: Lessons 5-8
Total questions: 20
Worksheet time: 10mins
Living things obtain ______ from their environment and release ______ back into it.
waste, energy
waste, matter
matter, waste
energy, sunlight
What do all food chains have in common?
They are all made up of the same organisms in different orders.
They all produce and use the same amount of energy.
They all have more consumers than producers.
They all begin with a producer.
Why is the base of an energy pyramid larger than the top?
Organisms at the top produce energy for organisms at the bottom.
Energy is converted into matter to form larger organisms at the top.
Organisms at the top use less energy than organisms at the bottom.
Energy is lost as heat at each level so less energy is available at the top.
Since humans can eat foods from many different ecosystems, they are
part of many food webs.
not counted as consumers.
part of a simple food chain.
considered to be producers.
How are food chains related to food webs?
Food webs consist of overlapping food chains.
Food chains occur on land whereas food webs occur in water.
Food chains are made up of individual food webs.
Food chains produce energy for food webs.
In a healthy ecosystem,
there is one large group of a single type of organism.
many different kinds of organisms can meet their needs.
organisms never have to compete to use the same resources.
there are no consumers so producers can grow without being eaten.
If just one species in a food chain disappears,
all of the other organisms will have more food.
other organisms will start making their own food.
any organisms that depend on that species for food will not be able to meet their needs.
no other organisms will be affected.
On Isle Royale, many wolves died because they had less food. With fewer predators, the number of moose
decreased slowly.
decreased rapidly.
increased quickly.
remained the same.
Herons will sometimes stand motionless in their habitat for an hour, waiting to catch their prey. They’ve even been known to swallow turtles whole.
What would happen to the herons if the number of turtles decreased in this habitat?
The turtles’ food supply would decrease.
The herons would become prey to other predators.
Herons would eat the turtles’ food instead and remain healthy.
The herons’ food supply would decrease and hurt their survival.
There are many species found in this coral reef ecosystem, such as algae living inside and outside the coral. You can see a variety of fish that eat the coral and the sharks that eat the fish.
Which of the following claims about this ecosystem is supported by the evidence?
It is unhealthy because fish have to compete to use the same resources.
It is healthy because there are more prey than predators found here.
It is healthy because there are many producers and consumers that can meet their needs.
It is unhealthy because there are no predators, but there are many kinds of producers and prey.
What do most scientists think about Earth’s climate?
It is not changing.
It is slowly warming.
It is slowly cooling.
Most scientists cannot agree.
What might a warming climate be dangerous for polar bears?
They need a lot of ice to hunt for food.
Their fur is so thick that they can get sick if it is too warm.
They cannot find mates to reproduce unless it is cold.
It is not dangerous for polar bears.
How does a warming climate affect a plant’s life cycle?
Plants lose their leaves in the summer.
Plants cannot grow seeds until after a cold winter.
Some plants grow and bloom earlier in the spring.
Climate change does not affect a plant’s life cycle.
A natural change to an ecosystem occurs when
a severe drought causes plants to die.
trees are cut down to make paper.
roads are built through a forest.
a dam is constructed to hold back water.
Climate change can cause changes to ecosystems. What can happen to organisms that do not change with their ecosystems?
They can disappear from Earth.
They can stop the ecosystem from changing.
They can form new ecosystems.
They can be unaffected by the change.
What do scientists call a non-native organism that causes harm to its new ecosystem?
An invasive species
A keystone species
A new species
Scientists do not have a special term for these organisms.
What is one reason that invasive species can be bad for their new ecosystems?
They die suddenly, and they are not decomposed.
They often have no natural enemies.
They get lonely in a new ecosystem.
Invasive species are always good.
True or false: Invasive species are always brought to a new ecosystem on accident.
True
False
Clearing prairies to plant crops is a negative change to ecosystems because
people plant trees to replace the ones they cut down.
the way organisms interact in food webs is disrupted.
humans are using the land to build farms instead of homes.
organisms interact in the same ways before and after the change.
After an ecosystem has been destroyed, it
sometimes can be restored.
always slowly recovers on its own.
can never recover from the damage.
usually returns back to how it was before.
