Stomata let gases in and out. CO2 is
used in the light independent reaction
It is produced in respiration and
is released as a waste product
Fluctuations
Daily Fluctuations --->
Annual Fluctuations -->
Since the Industrial Revolution there has
been a general increase in CO2 Levels
In the day plants photosynthesise as
light dependant respiration can occur.
At night plants so not photosynthesise and
so do not use as much Carbon Dioxide
As the CO2 levels rise,
so is the temperature
Ocean
The ocean can act as a carbon sink
by dissolving CO2. Fossilisation also
occurs which locks up CO2
Saprobionts
They hydrolyse carbon locked up in dead creatures. They do this by
secreting enzymes in extracellular digestion. They also respire, releasing
CO2 into the atmosphere.
If an organism dies somewhere saprobionts cannot reach
the carbon is locked up. This can occur in peat bogs, or
in the Ocean.