Unit 1, Part 2 Study Guide Review

Define the term predation. Give an example of a predator and a prey.

• one species hunts and eats the other for food; salmon and bears

• one species competes with another for food; lions and hyenas

• both organisms benefit; bee and flower

E. coli bacteria living in intestines help humans with the absorption of numerous vitamins, including vitamin K. On the other hand, humans  give back to the E. coli by supplying nutrients and a safe environment to live in. What type of symbiotic relationship is this? 

• Commensalism

• Mutualism

• Parasitism

Whales are not affected by barnacles being on their backs, bellies, or sides. Barnacles have an advantage by being on the whales as they are able to feed on microorganisms that float in the water as they ride on the whales.  What type of symbiotic relationship is this?

• Commensalism

• Mutualism

• Parasitism

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Ticks attach themselves to humans or other animals and survive by feeding on their blood.  The ticks are benefitting.  However, the human or other animal is harmed because the tick causes lyme disease.  What type of symbiotic relationship is this?

• Commensalism

• Mutualism

• Parasitsm

You and your sibling/ cousin fight for time in the bathroom or for the last piece of cake. What is this type of natural relationship?

• Commensalism

• Mutualism

• Parasitism

• Competition

What are some causes of competition?

• Mates

• Food

• Territory

• Water

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What is the competitive exclusion principle?

• When species compete there is no winner

• If two or more species live in the same habitat they will compete

• If two species have the same niche, they will compete for resources and only one can survive

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What is it called when competitive exclusion is overcome?

• Winning

• Resource partitioning

• Niche overlap

• Habitat accomodation

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Explain the role of a keystone species in an ecosystem.

• They are an apex predator

• They have a critical impact on their entire ecosystem

• Their removal would cause the ecosystem to decline or collapse

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What is the definition of a population?

• A group of the same organisms

• A group of the same organisms in the same area

• A group of organisms of the same species that live in the same area at the same time