Biogeo Review

What are the 4 nutrients that cycle through our ecosystem?

• Carbon

• Water (H2O)

• Phosphorous

• Nitrogen

• Energy

What happens if nitrogen fixing bacteria disappear?

• There will be an excess amount of nitrogen in the atmosphere

• There will be less nitrogen in the atmosphere

• There will be more usable nitrogen for plants

• There will be no affect.

What does an excessive amount of nitrates and phosphorous in the soil (too much fertilizer) do to our waterways?

• bodies of water absorb the nutrients and release them back into the atmosphere will no negative affects

• nothing, the nitrates are broken down by nitrogen fixing bacteria and used by plants as usual

• surface runoff takes excess nutrients to bodies of water, causing eutrophication

• surface runoff takes nutrients to the water which increases the biodiversity in the water

What is eutrification?

• excessive nutrients in the water leads to algae growth, loss of oxygen and death of organisms in the water

• the process of nitrogen fixing bacteria in the soil, taking N2 and turning it into usable forms by plants

Nitrogen fixing bacteria live in the legumes (nodules of plants). What would happen if legumes were pulled from crops?

• no impact, the bacteria would just live in the soil

• there would be an excess amount of usable nitrogen in the soil

• there wouldn't be as much usable nitrogen in the soil

What are two things that return CO2 into the atmosphere?

• combustion (burning of fossil fuels)

• oceans

• plants

• cellular respiration

What are the biggest carbon sinks (things that absorb CO2 from the atmosphere)?

• ocean

• animals

• limestone

• plants (forests)

Does the data shown support such a position?

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What happens with an increase in combustion of fossil fuels?

• increased greenhouse gases which leads to a decrease in temperature

• increased greenhouse gases which leads to an increase in temperature

When it comes to the water cycle, what pulls impurities out of the atmosphere?

• condensation and precipitation

• transpiration

• surface runoff

• evaporation