Ecosystem Interactions Assessment

Which image best represents mutualism?

• I
• II
• III

Which of the following most likely demonstrates a competitive relationship for the same resources?

• Owl and field mouse
• Oak tree and pine tree
• Spider and fly
• Shark and remora fish

Which image best represents parasitism?

• I
• II
• III

Based on the diagram, which three consumers obtain energy directly from the same producer?

• Squirrel, deer, and mountain lion
• Squirrel, robin, and field mouse
• Prairie grass, deer, and mountain lion
• Plant seeds, field mouse, and snake

Which image best represents commensalism?

• 1
• II
• III

Which level is the producer?

• secondary predator
• primary predator
• herbivore
• plants
• soil

Eagles and grizzly bears live together in the same habitat. There will be increased competition between the eagles and the grizzly bears if which of the following is true?

• Pesticides in the fish population affect eagles’ eggs and decrease their population.
• Laws prevent humans from being able to hunt eagles or grizzly bears.
• Grizzly bears hibernate during the winter while eagles remain active.
• Grizzly bears and eagles occupy similar niches.

The diagram shows energy transfer in an ecosystem. What belongs in the first box of the diagram?

• Bacteria
• Soil
• Sun
• Water

Food webs show the complex relationships of energy flow in an ecosystem containing a variety of producers and consumers. Which of the following correctly shows one path that energy would flow through this ecosystem?

• Star grass → termite→ wildebeest→ aardvark
• Hyena → aardvark → impala → harvester ant
• Grasshopper → termite→ warthog → hare
• Red oat grass → harvester ant → aardvark→ hyena

A new fish that also eats plants is introduced into a pond. What changes would most likely occur to this pond ecosystem?

• The large fish population will decrease.
• The plant population will decrease.
• The small fish population will increase.
• The new fish population will decrease.