Transcript nitrogen fixing bacteria

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