Biogeochemical cycle Review

Matter can recycle the biosphere because

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

• matter is passes out of the body as waste

• matter is assembled into chemical compounds

• biological systems use only carbon, oxygen hydrogen and nitrogen

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Nitrogen fixation is carried out primarily by

• human

• bacteria

• plants

• consumers

What is the process by which bacteria convert nitrogen gas in the air to ammonia?

• decompostition

• denitrification

• excretion

• nitrogen fixation

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

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

• more productive because the legumes bacteria keep away pests

• less productive because legumes have already taken all the nitrogen carbon and phosphorus from the soil

• less productive because leguemes remove phosphorus from the soil

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What two processes would increase would cause an increase in carbon dioxide?

• photosynthesis and burning fossil fuels

• Respiration and burning fossil fuels

• Respiration and the dissolving of carbon dioxide

• photosynthesis and the decomposition of wastes

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If the amount of atmospheric CO2 were decreased, what would be the most direct effect on area

• some consumers would become photosynthetic

• producers would have less material for making food

• consumers/ producers would increase the rate of respiration

• decomposers would increase in number

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What process would producers be unable to complete due to a decrease in atmospheric CO2?

• Cell Respiration

• Denitrification

• Photosynthesis

• Infiltration

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Which situation would lead to a decrease in CO2 in the atmosphere??

• Using coal to power a factory

• Burning logs in a fireplace

• Humans planting trees in a forest

• animals eating mushrooms in a field

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If bacteria on the roots of legumes were prevented from forming nitrogen fixing nodules, what would the impact be?

• The plants would no longer be able to perform photosynthesis.

• The soil would become depleted of usable nitrogen for plants.

• The plants would increase water consumption to due to loss of nitrogen.

• The concentration of atmospheric nitrogen gas would decrease.

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The end result of severe eutrophication will always be:

• regrowth of new life because of nitrates in the water

• the death of phytoplankton wen it over accumulates

• growth of more plant life because they grow well with phytoplankton

• massive die off of both plant and animals in aquatic areas.

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