AP Environmental Science Chapter 3 Review

The step in the nitrogen cycle where plants take up nitrate and use it to make biological molecules is:

• nitrification
• ammonification
• nitrogen fixation
• assimilation

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The step in the nitrogen cycle where bacteria convert ammonia (NH₃) to nitrate (NO₃^-) is:

• nitrification
• ammonification
• nitrogen fixation
• assimilation

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The process where some bacteria remove nitrate from the soil by converting it to nitrogen gas is:

• nitrification
• nitrogen fixation
• denitrification
• nitrification

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What part of the nitrogen cycle deals with the conversion of nitrogen in waste products or dead organisms into ammonia?

• nitrification
• ammonification
• denitrification
• nitrogen fixation

What is the first step in the nitrogen cycle, in which gaseous nitrogen is converted into ammonia?

• nitrification
• ammonification
• denitrification
• nitrogen fixation

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Nitrogen is essential for living organisms to make:

• Lipids
• Carbohydrates
• Proteins
• Fats

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Biogeochemical cycles: 

• only include processes conducted by or within living organisms.
• describe the movement of water and other materials throughout the abiotic and biotic environment.
• only pertain to exchanges and interactions that occur within the atmosphere.
• are used to describe the attempts of humans to recycle various pollutants.

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Which of the following can naturally "fix" atmospheric nitrogen so plants can utilize it?

• only bacteria
• bacteria and lightening
• herbivores
• carnivores

In this Food Web Pyramid Which type of consumer gets only 10% of the energy stored in plants?

• Herbivore
• Carnivore
• Omnivore
• Top carnivore

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In the energy pyramid shown, which organism has the least amount of biomass?

• Producers
• Herbivores
• Carnivores
• Top Predator

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