Unit 1: Biogeochemical Cycles Review

What is happening to water at D in Figure 3–3?

• Water is falling to the ground as precipitation.

• Water is evaporating from the ocean.

• Water is being taken up by plants through transpiration.

• Water is infiltrating/percolating into the ground to become groundwater.

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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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Which part of Figure 3–3 shows transpiration?

• A on the left

• B on the left

• A on the right

• B on the right

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Carbon cycles through the biosphere in all of the following processes EXCEPT

• photosynthesis.
• transpiration.
• decomposition of plants and animals.
• burning of fossil fuels.

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Animals get the most of the nitrogen they need

• by consuming plants or other animals.
• by breathing in atmospheric nitrogen.
• directly from bacteria in the soil.
• from the process of denitrification.

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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 true about phosphorus?

• Phosphorus is found primarily in the atmosphere.
• Phosphorus is found in fertilizer and can runoff into bodies of water

• Phosphorus can be “fixed” by lightning.
• Phosphorus is released into the air when animals exhale carbon dioxide.

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

• Nitrogen
• Carbon
• Water
• Oxygen

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Why are algae so important in aquatic ecosystems?

• They are primary producers
• Break down dead organisms
• Convert inorganic nitrogen into organic nitrates
• recycle chemical compounds

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What is the outcome of an algal bloom if balance isn't restored?

• 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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