How is carbon dioxide put back into the atmosphere?
CO2 is put back into the atmosphere by respiration by plants and animal, the combustion of fossil fuels and decomposers, such as bacteria and fungi respiring too.
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What bacteria do plants rely upon to make nitrogen available?
Nitrifying bacteria converts ammonia into nitrogen, and nitrogen-fixing bacteria in the soil or root nodules of peas, beans and clover 'fix' nitrogen gas by converting it into ammonia/nitrates, allowing plants to have proteins.
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Why is the recycling of nutrients more difficult in acidic or waterlogged soils?
Nutrients cannot easily be recycled in acidic or waterlogged soils as the lack of oxygen hinders microbial respiration; a plentiful supply of oxygen in well-drained soils makes the recycling much quicker.
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What does denitrifying bacteria do?
Denitrifying bacteria break down soil nitrates to release nitrogen gas back into the atmosphere - this is not beneficial for plants.
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How is carbon recycled in the sea?
The shells of some marine organisms contain carbonates or are made of calcium carbonate. When these organisms die, their shells collect on the sea floor where over millions of years they form limestone. This is attacked by acid rain to release CO2.
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Other cards in this set
Card 2
Front
What bacteria do plants rely upon to make nitrogen available?
Back
Nitrifying bacteria converts ammonia into nitrogen, and nitrogen-fixing bacteria in the soil or root nodules of peas, beans and clover 'fix' nitrogen gas by converting it into ammonia/nitrates, allowing plants to have proteins.
Card 3
Front
Why is the recycling of nutrients more difficult in acidic or waterlogged soils?
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