The Center for Disease Control publishes articles explaining the causes of seasonal West Nile virus. Research proves mosquitoes in freshwater ecosystems spread the disease to humans and other organisms. How do mosquitoes transmit the West Nile virus to other organisms?

Question 1 options:

Mosquitoes transmit the virus as parasites which feed on the blood of host organisms and inject the virus during feeding.


Mosquitoes transmit the virus when they land on the skin of an organism.


Mosquitoes transmit the virus as hosts who feed on the blood of organisms and inject the virus during feeding.


Mosquitoes transmit the virus by preying on organisms and spreading the virus on contact.

Question 2 (1 point)
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Predator/Prey Food Web

Which relationship in the food web above is NOT predator/prey?

Question 2 options:

Bird/Insect


Bear/Mouse


Red Fox/Rabbit


Wolf/Deer

Question 3 (1 point)
Which example describes organisms competing for an abiotic factor?

Question 3 options:

Cacti compete for water in the desert.


Lions and hyenas compete for a downed zebra.


Brightly colored flowers attract pollinators.


Male elephant seals compete on a beach for mates.

Question 4 (1 point)
Use the terrestrial ecosystem food web to answer this question.

Terrestrial Ecosystem Food Web

Leopards eat baboons and impalas in a terrestrial ecosystem. What prediction can be made if the baboon population begins to decrease because of disease?

Question 4 options:

The leopard population will increase.


The hawk population will increase.


The scorpion population will decrease.


The impala population will decrease.

Question 5 (1 point)
Which relationship best describes the interaction between a tapeworm and a human intestine?

Human Intestine Food Web

Question 5 options:

Parasite and Host


Biotic and Abiotic


Predator and Prey


Producer and Consumer

Question 6 (1 point)
Which of the following best describes a predator/prey relationship in the forest?

Question 6 options:

bacteria and mold break down fallen leaves on the forest floor


a spotted owl swoops down and captures a mouse


a deer eating the green leaves and berries on a holly bush


mistletoe growing on a Mesquite tree

Question 7 (1 point)
In the marine food web, which organism are considered predators to more than one organism?

Marine Food Web

Question 7 options:

Leopard seal and cod


Squid and zooplankton


Krill and phytoplankton


Penguin and elephant seal

Question 8 (1 point)
Use the information below and your knowledge of science to answer the question below.

Tree Population Per Year

Which is the best explanation for the trend in the two populations?

Question 8 options:

The grass population decreases because of lack of water.


The tree population decreases because the grass uses all the nutrients in the soil.


The grass population decreases because the canopy trees block the sunlight it needs for survival.


The tree population increases because of nutrients from the grass.

Question 9 (1 point)
Use the food web below and your knowledge of science to answer the question below.

Group 4 Food Web

Hawks are predators to small organism such as snakes, rabbits, and mice. What is a possible result of adding a hawk to this ecosystem?

Question 9 options:

The rabbit population will increase.


The grass population will increase.


The cougar population will increase.


All of the above

Question 10 (1 point)
Which statement could be supported by the graph?

Time versus Population Density Graph

Question 10 options:

The number of frogs will decrease in response to an increase in the fly population.


The number of coyotes will decrease in response to an increase in the rabbit population.


The number of hawks will decrease in response to a decrease in the mice population.


The number of grasshoppers will increase in response to an increase in the bird population.