Ecosystems Review - Part 3

The diagram shows a food web for an ocean ecosystem.

How would an increasing shark population most likely affect this ecosystem?

• The algae population would decrease.

• The limpet population would decrease.

• The seagull population would decrease.

• The octopus population would decrease.

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The diagram shows the connection between aquatic and terrestrial food webs.

Which best describes what happens when an owl attacks and kills a fish for food?

• an interconnection between aquatic and terrestrial food webs.

• an interconnection between terrestrial organisms and predators.

• an interconnection between aquatic food webs and decomposers.

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A diagram of the carbon dioxide cycle is shown.

At which points are carbon dioxide and methane primarily produced?

• B and D

• B and H

• E and H

• H and I

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NGSS.MS-ESS2-1

The cycling of oxygen within an ecosystem is shown in the diagram.

Which best describes changes within the ecosystem that will increase the amount of oxygen in the atmosphere?

• increase in the amount of grass, increase in the number of animals

• increase in the amount of grass, decrease in the number of animals

• decrease in the amount of grass, decrease in the number of animals

• decrease in the amount of grass, increase in the number of animals

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Which best explains the role of plants in the carbon cycle?

• Plants take in oxygen and release carbon dioxide.

• Plants take in carbon dioxide released by other organisms.

• Plants take in carbon dioxide and pass it directly to animals.

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Which organism is most likely to use energy to transform atmospheric nitrogen into a more usable form?

• humans

• soybeans

• paramecia

• earthworms

Which group in a food web is most likely to change atmospheric nitrogen into forms that are usable?

• consumers

• decomposers

• producers

• scavengers

Which consume(s) energy from dead organisms?

• the Sun

• producers and consumers

• trees, grasses, and shrubs

• scavengers, fungi, and bacteria

Which best explains the role of bacteria in an ecosystem?

• They break down organic matter into necessary nutrient components.

• They release energy from the decomposition of atmospheric gases.

• They convert carbon dioxide and water into simple carbohydrates.

• They absorb energy from the synthesis of inorganic compounds.

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Which best describes the role of nitrogen-fixing bacteria in the flow of energy?

• They convert carbon dioxide into nitrogen.

• They convert nitrogen into carbon dioxide.

• They convert sunlight and nitrogen into energy-rich sugar molecules.

• They convert atmospheric nitrogen into molecules that other organisms can use.