The total mass of living material in a specific area at a given time, usually measured as dry mass as water value is variable
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What is the meaning of niche?
All conditions and resources required for an organism to survive, reproduce and maintain population
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An organism that obtains food from dead or decaying remains of other organisms is called what?
Saprobiotic Microorganism (Saprophyte)
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The flow of nutrients such as carbon and nitrogen flows in what shape?
Cyclic so is continuous
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What type of organisms remove carbon dioxide from the air?
Photosynthetic organisms
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Why is the Carbon dioxide concentration higher at night?
This is due to photosynthesis ceasing while respiration carries on
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What human activities cause an increase in carbon dioxide?
Deforestation and Combustion of fossil fuels
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Methane, water vapour and Carbon dioxide are all?
Greenhouse Gases
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What do Saprophytes use to break down large insoluble molecules into smaller soluble molecules?
Enzymes
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When decay is prevented what forms?
Fossils
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The Earth's atmosphere is heating up due to?
The Greenhouse Effect where greenhouse gases are building up in the atmosphere so the sun's rays get trapped and heat up the atmosphere
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Name consequences of global warming
Chance of reduced number of animal species due to the change in temperature causing them to migrate to places where they compete for niches,melting ice caps could cause extinction for species such as polar bears and low land may be flood
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Name a possible benefit of global warming
Benefit could be more rainfall filling reservoirs, higher temperatures causing higher rate of photosynthesis so more productivity and a larger harvest
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What are the 4 steps of the nitrogen cycle?
Ammonification, nitrification, nitrogen fixing and denitrification
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In nitrification what compounds are converted and to what?
1. Oxidation of ammonium ions to nitrite ions (NO₂¯), 2. Oxidation of nitrite ions to nitrate ions (NO₃¯)
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What are artificial fertilisers made of?
Mined from rocks and deposits then converted into different forms to give the appropriate balance of minerals , compounds contain nitrogen, phosphorus and potassium
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Why is nitrogen required in plants?
Plants require minerals for growth, nitrogen is needed for proteins and DNA
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What bad effects can nitrogen fertilisers cause?
Leaching and Eutrophication
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What is leaching?
The process by which nutrients are removed from the soil
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What is Eutrophication
The process by which nutrients build up in bodies of water
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Other cards in this set
Card 2
Front
What is the meaning of niche?
Back
All conditions and resources required for an organism to survive, reproduce and maintain population
Card 3
Front
An organism that obtains food from dead or decaying remains of other organisms is called what?
Back
Card 4
Front
The flow of nutrients such as carbon and nitrogen flows in what shape?
Back
Card 5
Front
What type of organisms remove carbon dioxide from the air?
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