Unit 4- Interdependence of Organisms

Explain the role of producers in a food web and how they contribute to energy transfer.

• Producers consume other organisms to obtain energy.

• Producers decompose organic matter to release energy.

• Producers convert sunlight into chemical energy through photosynthesis.

• Producers compete with consumers for energy.

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DOK Level 1: Recall

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Compare and contrast mutualism and parasitism by selecting the correct statement.

• Both mutualism and parasitism benefit both organisms involved.

• Mutualism benefits both organisms, while parasitism benefits one organism at the expense of the other.

• Parasitism benefits both organisms, while mutualism benefits only one organism.

• Both mutualism and parasitism harm both organisms involved.

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DOK Level 2: Skill/Concept

Identify the limiting factor in a local ecosystem that could lead to a decrease in a native bird population.

• Abundant food supply

• Increased nesting sites

• Limited water availability

• Decreased predation

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DOK Level 1: Recall

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Describe how competition can affect the population size of two species in the same habitat.

• Competition always leads to the extinction of one species.

• Competition can lead to a decrease in population size for both species.

• Competition increases the population size of both species.

• Competition has no effect on population size.

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DOK Level 2: Skill/Concept

Explain how decomposers contribute to the energy transfer in a food web.

• Decomposers produce energy through photosynthesis.

• Decomposers consume producers for energy.

• Decomposers break down dead organisms, returning nutrients to the soil.

• Decomposers compete with consumers for energy.

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DOK Level 1: Recall

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Investigate the impact of disease as a limiting factor in a local ecosystem.

• Disease increases the population size of native species.

• Disease has no impact on the population size of native species.

• Disease can decrease the population size of native species.

• Disease always leads to the extinction of native species.

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DOK Level 2: Skill/Concept

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Strategically plan how a decrease in producers would affect a food web.

• It would have no effect on the food web.

• It would increase the number of consumers.

• It would decrease the energy available to consumers and decomposers.

• It would increase the energy available to decomposers.

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DOK Level 3: Strategic Thinking

Compare the effects of predation and competition on an ecosystem.

• Predation and competition both increase biodiversity.

• Predation decreases biodiversity, while competition increases it.

• Predation and competition both decrease biodiversity.

• Predation can control population size, while competition can limit resources.

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DOK Level 3: Strategic Thinking

Describe the role of water as a limiting factor in an ecosystem.

• Water is always abundant and does not limit populations.

• Water scarcity can limit the growth and survival of organisms.

• Water abundance can decrease population sizes.

• Water has no effect on ecosystem dynamics.

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DOK Level 1: Recall

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Illustrate the relationship between a predator and its prey in a food web.

• Predators provide energy to prey.

• Prey consume predators for energy.

• Predators hunt and consume prey for energy.

• Predators and prey compete for the same resources.

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DOK Level 1: Recall