Nutrient Cycles in the Ecosystem

What is this a picture of?

• Nitrogen cycle

• carbon cycle

• water cycle

• plant cycle

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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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Matter can recycle through the biosphere because

• matter does not change into new compounds.

• matter is assembled into chemical compounds.

• biological systems do not use up matter, they transform it.

• biological systems use only carbon, oxygen, hydrogen, and nitrogen.

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If a lake receives a large input of a limiting nutrient, which of these would happen first?

• An algal bloom occurs.

• Algae begin to die and decomposers take over.

• Nitrogen compounds are recycled.

• The concentration of oxygen drops below the necessary level.

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Which of the following is a limiting nutrient in an aquatic ecosystem?

• Nitrogen

• Carbon

• Water

• Oxygen

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Nitrogen fixation is carried out primarily by

• humans.

• plants.

• bacteria.

• consumers.

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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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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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Matter is __________ in and between ecosystems.

• recycled

• destroyed

• created

• lost

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Cycles of matter involve all of the following processes except.

• geological

• biological

• chemical

• physical

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