Nutrient Cycles 0.0 / 5 ? BiologyEcology and biodiversityA2/A-levelAQA Created by: elyornaisCreated on: 13-12-15 13:38 What is meant by carbon neutral? Carbon fixation and carbon release are balanced. 1 of 12 What is decay? The breakdown of detritus by organisms called decomposers. 2 of 12 What are saprobionts? Microbes that live on detritus using saprobiotic nutrition. Bacteria or fungi. 3 of 12 What are detritivores? Small invertebrate animals that eat detritus. Speed up decomposition by helping saprobionts. 4 of 12 What is meant by ammonification? Production of ammonia from proteins or urea etc. 5 of 12 What is nitrogen fixation? Reduces nitrogen gas to ammonia,ammonia dissolves into ammonium ions. 6 of 12 What is nitrification? Converting ammonia into nitrite ions and then into nitrates. 7 of 12 What is denitrification? Breakdown of nitrates into nitrogen gas by denitrifying bacteria. 8 of 12 How do plants accumulate nitrates? Active transport in root hair cells. 9 of 12 How could a rise in nitrate concentration happen in a river? Leaching of nitrogen fertilisers or breakdown of dead organic matter. 10 of 12 Advantage of leguminous plants? Contain nitrogen fixing bacteria in root nodules, covert nitrogen to ammonia, released on decomposition and converted to nitrates. 11 of 12 Advantage of fish feeding on algae rather than other fish? Shorter food chain so greater yield of fish. 12 of 12
Exchanges with the external environment of both cells and organisms to maintain their internal environment 0.0 / 5
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