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B1 Week 1.2

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Sara Kaikkonen

on 24 August 2015

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Transcript of B1 Week 1.2

B1 Week 1.2
Carbon Cycle and Decay

Saprotrophic feeding
The carbon cycle
What removes Carbon Dioxide from the atmosphere?
What releases Carbon Dioxide into the atmosphere?
Detrivores - small animals that eat and digest dead material
Decomposers -bacteria and fungi that chemically break down dead material
Combustion - burning of fuels in the presence of oxygen

e.g. earthworms, millipedes and woodlice

Eat small pieces of dead material and digest it

This increases the surface area of the waste for decomposers to then act on
e.g. bacteria and fungi

Chemically break down dead material

Release ammonia
Most decomposers release enzymes on the dead animal/plant
The enzymes digest the dead material
Decomposers then absorb the digested chemicals
Conditions needed for decay
Decay happens faster at certain times of the year because the conditions are best.
Plenty of food (dead plants or fallen leaves)
A suitable temperature
In which time of year do you think most decay happens?

Dissolving into oceans


The Carbon Cycle diagram
Fossil formation
Carbon is trapped in fossil fuels until it is released by burning (combustion)

Fossil fuels are formed from plant and animal bodies over millions of years, by burial under layers of silt
Combustion (burning)
Burning fossil fuels releases the carbon that was stored millions of years ago, as carbon dioxide gas

The burning of plant and/or animal matter also releases carbon dioxide

Coal, oil and gas are a major source of energy
Can you remember the word equation?
Plants and animals respire to release energy for life processes
This returns some carbon dioxide into the atmosphere
When plants and animals die, microbes digest their bodies in the process of decay
this releases carbon dioxide back into the atmosphere
Not all plants and animals decay - some get buried and fossilise
Can you remember the word equation?
Carbon dioxide is absorbed by green plants and algae during photosynthesis
The carbon dioxide is used to make glucose (a carbohydrate)
Plants are eaten by animals so carbon compounds are passed on
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