LS2.3 BIO1 Review

When moist air comes in contact with a cold surface in the winter, one result can be frost. What is the process that occurs when water vapor in the air turns to frost?

• sublimation

• deposition

• evaporation

• condensation

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BIO1.LS2.3

Which statement about the cycling of materials through a stable ecosystem is true?

• Certain species of bacteria are responsible for cycling nitrogen from the atmosphere to plants.

• Carbon dioxide is continuously cycled through a stable ecosystem, but only bacteria can convert it to a usable form.

• Radiant energy and heat are continuously recycled from animals to plants.

• Water and energy are the only materials in an ecosystem that cannot be recycled.

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The nitrogen cycle revolves largely around the ability of plants to obtain and use nitrogen in relationship with several species of bacteria.

At which location in the diagram would denitrifying bacteria, which break down nitrogen compounds to produce elemental nitrogen, N₂, be found?

• W

• X

• Y

• Z

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NGSS.MS-LS2-3

Nitrogen fixation is a process by which nitrogen in the atmosphere is made available to plants in a more usable form.

What form of nitrogen is indicated by the letter X in this figure?

• nitrate

• nitrogen dioxide

• nitrogen trioxide

• nitrosamine

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The diagram shows the water cycle.

When are impurities such as dust and particulates removed from the atmosphere?

• during Condensation and Precipitation

• during Evaporation and Transpiration

• during Runoff and Precipitation

• during Condensation and Evaporation

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NGSS.MS-ESS2-4

Bacteria are detritivores that live in soil and water. Bacteria feed on dead plants and animals and break them down into simpler elements.

How does this action help the ecosystem?

• by recycling nutrients

• by retaining soil moisture

• by synthesizing energy molecules

• by increasing air spaces in the soil

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NGSS.MS-LS2-3

The water cycle follows the flow of water in various forms throughout Earth.

What process in the water cycle is illustrated by the letter X in this diagram?

• denitrification

• photosynthesis

• precipitation

• transpiration

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Nutrients are continually reused and flow through an ecosystem from organism to organism.

What is a specific example of an organism that could be represented by the letter X on the nutrient cycle?

• bacteria

• deer

• ferns

• lions

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NGSS.MS-LS2-3

How is the role of nitrogen fixing bacteria in the nitrogen cycle best described?

• They convert free nitrogen into substances that other organisms can use.

• They release free nitrogen from nitrogenous compounds into the atmosphere.

• They produce enzymes necessary for the production of nitrogen in the environment.

• They store nitrogen from the atmosphere and provide it to organisms in need of nitrogen.

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A diagram outlining the phosphorus cycle in an ecosystem is shown.

If the amount of phosphates present in water increases, what would be the most direct effect on the ecosystem?

• It will result in a decrease of phosphates in animal tissues and wastes.

• It will result in a decrease in the weathering of rocks.

• It will result in an increase in the rate of decomposition by bacteria and fungi.

• It will result in an increase in the incorporation of phosphates into sedimentary rocks.

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