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Living thing require nutrient cycles ( nitrogen cycle) because Some organism ( decomposers) obtain energy from the break down of dead bodies and waste Raw materials (element like Nitrogen and Carbon) are recycled for use by the next generation. Nitrogen is present in plants in the form of PROTEIN. The plants may DIE or they may be EATEN by animals. If plants die then nitrogen is in dead bodies If they are eaten, the animal gains the PROTEIN. PROTEIN IN PLANTS nutrition PROTEIN IN ANIMALS Nitrogen is in faeces or if animals die then nitrogen is in dead bodies The animals produce faeces, may die or they may be eaten by other animals. death Death and excretion DEAD BODIES or FAECES CONTAINING NITROGEN Bacteria and fungi act as decomposers and break down the faeces and dead bodies. They produce AMMONIA which is a compound containing nitrogen. The plants are unable to absorb ammonia, so NITRIFYING BACTERIA change ammonia into NITRITE Another group of NITRIFYING BACTERIA will then change NITRITE into NITRATE which can be absorbed by the plant. AMMONIA Nitrifying bacteria NITRITE Nitrifying bacteria NITRATE PROTEIN IN PLANTS nutrition death Absorbed by plant roots NITRATE PROTEIN IN ANIMALS Death and excretion DEAD BODIES and FAECES CONTAINING NITROGEN Nitrifying bacteria Decomposers Bacteria and fungi Nitrifying bacteria NITRITE AMMONIA Nitrogen can also be gained from the air. Special bacteria called NITROGEN FIXING BACTERIA live in the soil and take nitrogen out of the air and change it into soil nitrates.. NITROGEN IN THE AIR Denitrifying bacteria Nitrogen fixing bacteria NITRATES IN THE SOIL Other bacteria called DENITRIFYING BACTERIA break down the nitrates to release nitrogen back into the air. Finally, there are a special group of bacteria, also called NITROGEN FIXING BACTERIA, which live in root nodules of clover plants. They also remove nitrogen from the air. However, the bacteria give this nitrogen to the plant. The plant will make protein. NITROGEN IN THE AIR Nitrogen fixing bacteria in root nodules of clover plants PROTEIN IN PLANTS NITROGEN IN THE AIR Denitrifying Nitrogen bacteria fixing bacteria Nitrogen fixing bacteria in root nodules of clover plants PROTEIN IN PLANTS Absorbed by plant roots nutrition PROTEIN IN ANIMALS death Death and excretion NITRATE DEAD BODIES and FAECES CONTAINING NITROGEN Nitrifying bacteria Decomposers Nitrifying bacteria NITRITE Bacteria and fungi AMMONIA Lightning can also add nitrates to the soil. NITROGEN IN THE AIR Nitrogen can be lost from the soil by means of denitrifying bacteria and Nitrogen fixing leaching of nitrates into nearby rivers.bacteria in root Denitrifying Nitrogen nodules of clover bacteria fixing plants bacteria Lightning nutrition PROTEIN IN PLANTS PROTEIN IN ANIMALS Absorbed by plant roots death Death and excretion NITRATE DEAD BODIES and FAECES CONTAINING NITROGEN Leaching Nitrifying bacteria Decomposers RIVERS Nitrifying bacteria NITRITE Bacteria and fungi AMMONIA
