Unit 4: Symbiosis & Population Growth

Reindeer moss is actually not a moss but rather it is a LICHEN. Lichen are complex organisms that are created by a symbiotic relationship between a type of algae and a type of fungus. The fungus provides the algae with nutrients in return for protection, habitat and moisture. This relationship is an example of

• commensalism

• mutualism

• competition

• parasitism

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The corpse flower is the world's largest individual flower. Because it cannot make its own food (it actually doesn't have leaves), it must take food from neighboring Tetrastigma vines. This is an example of which type of food relationship?

• parasitism

• commensalism

• mutualism

• predation

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NGSS.MS-LS2-1

The graph shows that the population of white tailed deer declined (went down) in the early 1990s. What factor might have caused this?

• The competition for resources and food increased

• The population of producers within the ecosystem increased

• Different foods became available to the deer

• The population of predators decreased

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NGSS.MS-LS2-1

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The relationship between a hawk and a mouse is a

• mutualist relationship

• predator- prey relationship

• parasite-host relationship

• producer- consumer relationship

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Which of the following statements is true about cooperation among organisms within a community?

• Communities have organisms that prey on one another, so they are not cooperating.

• All organisms must cooperate so that the individuals can survive

• All organisms must cooperate so that all populations will survive

• Communities only have competition, not cooperation.

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In a mutualistic relationship, the organisms

• leave each other alone

• compete for resources

• feed on each other

• cooperate with each other

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During commensalism...

• one organism benefits while the other is neither helped nor harmed

• one organism benefits while the other is harmed

• both organisms benefit

• neither organism is affected by the other

Based on the food web, which terms best describes the food relationship that exists between the mouse and toad?

• competition

• mutualism

• cooperation

• parasitism

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NGSS.MS-LS2-2

What type of symbiosis?  

Hummingbirds feed on nectar from flowers.  The flowers are pollinated by hummingbirds as they move from flower to flower.

• mutualism

• commensalism

• parasitism

• competition

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NGSS.MS-LS2-2

What type of symbiosis?  

Skunks often live in burrows that have been dug and abandoned by woodchucks.  

• mutualism

• commensalism

• parasitism

• competition