Nutrient Cycles

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  • Created by: elyornais
  • Created on: 13-12-15 13:38
What is meant by carbon neutral?
Carbon fixation and carbon release are balanced.
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What is decay?
The breakdown of detritus by organisms called decomposers.
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What are saprobionts?
Microbes that live on detritus using saprobiotic nutrition. Bacteria or fungi.
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What are detritivores?
Small invertebrate animals that eat detritus. Speed up decomposition by helping saprobionts.
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What is meant by ammonification?
Production of ammonia from proteins or urea etc.
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What is nitrogen fixation?
Reduces nitrogen gas to ammonia,ammonia dissolves into ammonium ions.
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What is nitrification?
Converting ammonia into nitrite ions and then into nitrates.
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What is denitrification?
Breakdown of nitrates into nitrogen gas by denitrifying bacteria.
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How do plants accumulate nitrates?
Active transport in root hair cells.
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How could a rise in nitrate concentration happen in a river?
Leaching of nitrogen fertilisers or breakdown of dead organic matter.
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Advantage of leguminous plants?
Contain nitrogen fixing bacteria in root nodules, covert nitrogen to ammonia, released on decomposition and converted to nitrates.
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Advantage of fish feeding on algae rather than other fish?
Shorter food chain so greater yield of fish.
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Other cards in this set

Card 2

Front

What is decay?

Back

The breakdown of detritus by organisms called decomposers.

Card 3

Front

What are saprobionts?

Back

Preview of the front of card 3

Card 4

Front

What are detritivores?

Back

Preview of the front of card 4

Card 5

Front

What is meant by ammonification?

Back

Preview of the front of card 5
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