Biogeochemical Cycles Review Lesson

The movements of energy and nutrients through living systems are different because

• energy flows in one direction, and nutrients recycle.
• energy is limited in the biosphere, and nutrients are always available.
• nutrients flow in one direction, and energy recycles.
• energy forms chemical compounds, and nutrients are lost as heat.

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How does carbon dioxide leave the atmosphere?

• Through transpiration
• Through photosynthesis
• Through factory emission
• Sunlight

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Which process takes Carbon Dioxide from the air and converts it into a form of carbon used by living things?

• Precipitation
• Photosynthesis
• Respiration
• Bioremdiation

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Respiration is the process by which ____________ is consumed and _______________ is produced.

• Carbon, Oxygen
• Oxygen, Carbon dioxide
• H20, oxygen
• Carbon, H2O

Organisms use nitrogen to form

• carbohydrates and lipids
• proteins and lipids
• lipids and nucleic acids
• proteins and nucleic acids

A biogeochemical cycle explains:

• The formation of stars and planets.

• why certain animals are known as keystone animals.

• the flow of chemical elements between living organisms and the environment.

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How nitrogen is "fixed" into useable form for plants...

• through action of bacteria only
• through lightning only
• through action of bacteria & lightning
• through photosynthesis

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Process where excess nutrients enter body of water causing overgrowth of aquatic plants and algae...

• Eutrophication
• Acid Precipitation
• Nitrogen Fixation
• Decomposition

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How do plants get the nitrogen they need?

• from the air
• from the soil or water in which they live
• from the Sun
• from broken-down rocks

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Which nitrogen cycle process is occurring when plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids, and proteins?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation