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Problems and profit with waste Lesson 2 Micro-organisms and decay Decomposers When an animal or plant dies, the chemicals present in their bodies need to be released back into the ecosystem This happens by the action of decomposers Decomposers Nutrient recycling Consumers Sunlight die animals eaten Producers die Green plants Bacteria and fungi Soil minerals Water And salts Decomposers And humus decay The nitrogen cycle Nitrogen from the air is converted to nitrates by nitrogen fixing bacteria. Some of these bacteria live in root nodules on clover and in pea and bean plants. The roots of the plant take in nitrates and use them to make plant protein. The nitrogen cycle The nitrogen cycle The animals then eat the green plant to get nitrogen to make animal proteins When the animal or plant dies, nitrates are added to the soil when they decay The nitrates are changed to nitrogen gas through the action of denitrifying bacteria More about the nitrogen cycle Bacteria bring about the decomposition of dead bodies and waste releasing compounds containing ammonium into the soil. Bacteria convert these ammonium compounds into nitrites More bacteria then convert them to nitrates which can be used by plants Quiz – into jotters Name one of 3 micro-organisms which can carry out decomposition of tissues. Why do we need decomposers? What kind of micro-organism is found in root nodules of plants? Why do micro-organisms carry out decay.. What’s in it for them? Name a chemical which is recycled from dead animals and plants.