9th 3:4- Cycles of Matter/Biogeochemical Cycles

Corn planted in a field that has been previously planted with legumes and then plowed under is likely to be

• more productivie because bacteria living on the roots of legumes fix nitrogen in the soil.

• less productive because legumes remove phosphorous from the soil.

• less productive because the legumes have already taken all the nitrogen, carbon and phophorus from the soil.

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The repeated movement of water between Earth's surface and the atmosphere is called

• the runoff cycle

• the condensation cycle

• the water cycle

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What is happening to water at A ?

• Water is falling to the ground as precipitation.

• Water is evaporating .

• Water is seeping into the ground to become groundwater.

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What is happening to water at D ?

• Water is falling to the ground as precipitation.

• Water is evaporating .

• Water is seeping into the ground to become groundwater.

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Which part of Figure 3-3 shows transpiration?

• A on the right

• B on the left

• A on the left

• B on the right

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

• photosynthesis

• decomposition of plants and animals

• transpiration

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Which part of the water cycle is a biological process?

• transpiration

• condensation

• precipitation

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Nitrogen fixation is carried out primarily by

• humans

• plants

• bacteria

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Animals get the most of the nitrogen they need

• from the process of denitrification

• by consuming plants or other animals

• directly from bacteria in the soil

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Organisms need nutrients in order to

• carry out essential life functions

• utilize hydrogen and oxygen

• recycle cheimical compounds

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