Understanding Symbiosis and Ecosystems

What is mutualism?

• A relationship where one species benefits and the other is unaffected

• A relationship where one species benefits and the other is harmed

• A relationship where both species are harmed

• A relationship where both species benefit

What is the main benefit bacteria receive from living in the human gut?

• Oxygen for respiration

• Ability to reproduce

• A place to live and food to eat

• Protection from pathogens

Which example illustrates commensalism?

• A lion hunting a zebra

• A bee pollinating a flower

• A hermit crab using an abandoned snail shell

• A bird feeding on a carcass

What is parasitism?

• A relationship where both organisms are unaffected

• A relationship where one organism is harmed and the other benefits

• A relationship where one organism benefits and the other is unaffected

• A relationship where both organisms benefit

What is the main function of an ecosystem's food web?

• To show the movement of water through living organisms

• To demonstrate the lifecycle of plants

• To display the relationships between producers and consumers

• To illustrate the transfer of energy between organisms

Which organism is considered a tertiary consumer?

• Snail

• Rat

• Owl

• Grasshopper

Which of the following is an example of a primary consumer?

• Tree

• Rat

• Grasshopper

• Owl

What role do plants play in an ecosystem?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

What percentage of energy is transferred from one trophic level to the next?

• 10%

• 50%

• 75%

• 25%