Photosynthesis &
Cellular Respiration
Aaron Geddes
P.5 Llanos
About Photosynthesis & Cell
Respiration
• In our earth all organism depend on free energy to
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sustain their life. The goal in living is to make ATP or
(Adenosine Triphosphate) to use this free energy.
Both Autotrophs and Heterotrophs use cellular
respiration to make ATP.
But since autotrophs make their own food they have to
undergo photosynthesis.
In the end all organism either an autotroph or a
heterotroph have to undergo processes to use free
energy.
Adenosine Triphosphate (ATP)
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Adenosine Triphosphate or ATP is basically the energy
currency for life.
It's a high-energy molecule that stores the energy we
need to do just about everything we do.
ATP is remarkable for its ability to enter into many
coupled reactions, both those to food to extract energy
and with the reactions in other physiological processes
to provide energy to them.
The ATP is synthesized in a cell's mitochondria.
Photosynthesis
• The process that most autotrophs use to make food is
called photosynthesis
• Autotrophs like plants take in carbon dioxide from the
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air and water from the soil; put them together (in the
presence of light energy and chlorophyll) to produce
sugar (glucose) and oxygen.
Some of the glucose produced in photosynthesis is
used for the plants growth and reproducing, while the
excess glucose is converted to starch and stored
throughout the plant.
The oxygen made from photosynthesis is then released
to the air, which animals and humans can use.
Cellular Respiration
• The process that every organism uses to break down
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chemical bonds to the readily usable energy currency
for life, or ATP.
Cellular Respiration the takes the products of
photosynthesis, glucose and oxygen to break down.
After the ATP is produced, carbon dioxide and water
are released as metabolic waste.
The carbon dioxide released binds with the water to
form carbonic acid, helping to maintain the blood's pH,
but since too much carbon dioxide lowers the blood's
pH the excess carbon dioxide has to be removed from
time to time.
Aerobic & Anaerobic Cellular
Respiration
Aerobic
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More Efficient (produces
38 ATP)
Performed by Eukaryotic
cells
Goes from cytosol to the
mitochondria
Uses Oxygen
Anaerobic
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Less Efficient (produced
2 ATP)
Performed by
Prokaryotic cells
Only in the cytosol
Does not use oxygen
Photosynthesis
Respiration
Cellular
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Occurs in the presence
of light (and chlorophyll
in plant cells)
Requires energy (light)
to make sugar (glucose)
Complex substances
(sugar) are formed from
simpler ones.
Carbon dioxide and
water are the raw
materials.
Oxygen is given out.
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Occurs at all times in
cells.
Releases energy from
sugar
Complex substances
(sugar) are broken down
into simpler ones
Carbon dioxide and
water are the waste
products.
Oxygen is taken in.