Worksheets8.13B Ecosystem Stability
Total questions: 18
Worksheet time: 41mins
Decomposer
This is an organism that breaks down and gains nutrients from dead organisms.
Predator
This is an animal that lives by preying on other animals.
Producer
This is an organism that supplies matter and energy, also known as an autotroph.
Consumer
This is an organism that relies on other organisms for its food and energy supply; heterotroph
Parasite
This is an organism which feeds on, but usually does not kill, a larger organism
Match the following:
Producer/Autotroph
Plant
Secondary Consumer
Bird
Tertiary Consumer
Snake
Top Predator
Owl
Herbivore
Grasshopper
Select the primary consumer(s).
The arrows in a food chain or web represents (a) .
Reorder the Trophic Levels beginning with the level that holds the MOST energy.
Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
Quaternary Consumer
For the food chain shown, which of the following changes would have the most severe consequences?
a drastic decrease in rainfall, causing a drought
the poaching of predatory hawks by game hunters
the introduction of a second predator that eats field mice
a parasitic infestation that reduces the cricket population
There would be more food for secondary consumers.
The number of primary consumers would increase.
The number of plants would increase.
The number of secondary consumers would increase.
Which of the following is a food chain in the food web?
Rabbit, mountain lion, fox
Grass, grasshopper, frog, snake, hawk
Grass, caterpillar, robin, mountain lion
Tree, deer, mountain lion, fox
A partial food web is shown above.
Which of the following will most likely occur if the grouse population decreases?
The butterfly population will increase.
The red-tailed hawk population will increase.
Emigration of grizzly bears and deer will increase.
Competition between grizzly bears and deer will increase.
Part of a hydrothermal vent food web is represented in the diagram. Which organisms are both secondary and tertiary consumers in this food web?
Chemosynthetic bacteria and amphipods
Zooplankton and mussels
Ratfish and octopuses
Galatheid crabs and zoarcid fish
These two species of birds, the egret and heron, eat the same types
of fish as their maindiet. They live in the same ecosystem.
How would the egrets in this area MOST LIKELY respond if all of the herons were removed from the area?
They would move to different ponds.
They would change to another diet.
They would build fewer nests.
They would have an increase in population.
In 2011, fires in Bastrop County, Texas, were the most destructive
wildfires in Texas history.
The fire spread through the Loblolly pine trees and scorched
nearly 5,700 acresof Bastrop State Park.
The majority of the Houston Toad’s habitat was lost, and
the Lost Pines Forest was heavily affected.
A food web of the Bastrop State Park environment is shown below.
The loss of habitat for the Houston Toad most likely affected
the food web by -
causing a decrease in the number
of wildflowers
causing an increase in the number
of insects
causing a decrease in the number
of armadillos
causing an increase in the number
of opossums
Asian carp are an invasive species of fish. These large fish eat up to 40% of their body weight per day by feeding on phytoplankton. The carp also reproduce quickly. If these fish were to enter Lake Erie, how would the Presque Isle coastal ecosystem most likely be affected?
Producers in the ecosystem would grow at a faster rate, and smaller fish such as yellow perch would thrive.
The invasive fish would prey on mollusks such as mussels, but native fish species would quickly eat the invasive fish.
Consumers in the higher trophic levels would suffer stress, but crustaceans such as amphipods would be unaffected.
Most consumers in the ecosystem would face a shortage of food, and larger fish, such as walleye, would be unable to thrive.
