PHOTOSYNTHESIS
Autotrophic Process: Plants and plant-like organisms make their energy (glucose) from sunlight.
Stored as carbohydrate in their bodies.
6CO2 + 6H2O + sunlight C6H12O6 + 6O2
Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar.
Plants use glucose as food for energy and as a building block for growing.
Autotrophs make glucose and heterotrophs are consumers of it.
Plant leaves have many types of cells!
Plant Cells
Oxygen and Sugar!
In plants and simple animals, waste products are removed by diffusion. Plants, for example, excrete O2, a product of photosynthesis.
PHOTOSYNTHESIS
Light-dependent reaction (LIGHT Reaction)
Requires light
Occurs in chloroplast (in thylakoids)
Chlorophyll (thylakoid) traps energy from light
Light excites electron (e-)
Kicks e- out of chlorophyll to an electron transport chain
Electron transport chain: series of proteins in thylakoid membrane
Bucket brigade
PHOTOSYNTHESIS
• Autotrophic Process: Plants and plantlike
organisms make their energy (glucose) from
sunlight.
• Stored as carbohydrate in their bodies.
• 6CO2 + 6H2O + sunlight C6H12O6 + 6O2
Photosynthesisstarts to ecological food webs!
Photosynthesis
Photosynthesis
means "putting together with light."
"putting together with light."
means
Plants use sunlight to turn water
and carbon dioxide into glucose.
Glucose is a kind of sugar.
Plants use glucose as food for
energy and as a building block
for growing.
Autotrophs make glucose and
heterotrophs are consumers of it.
What is
the
proces
s that
uses
the
sun’s
energy
to
make
simple
sugars
Plant leaves have many types
of cells!
• In plants and simple animals, waste products are
removed by diffusion. Plants, for example, excrete O2,
a product of photosynthesis.
PHOTOSYNTHESIS
• Lightdependent reaction (LIGHT Reaction)
– Requires light
– Occurs in chloroplast (in thylakoids)
– Chlorophyll (thylakoid) traps energy from light
– Light excites electron (e)
• Kicks e out of chlorophyll to an electron transport
chain
• Electron transport chain: series of proteins in
thylakoid membrane
– Bucket brigade
PHOTOSYNTHESIS
• Lightdependent reaction (LIGHT Reaction)
– Energy lost along electron transport chain
– Lost energy used to recharge ATP from ADP
– NADPH produced from e transport chain
• Stores energy until transfer to stroma
• Plays important role in lightindependent reaction
– Total byproducts: ATP, NADP, O2
PHOTOSYNTHESIS
• Lightindependent reaction (Dark Reaction)
– Does not require light
– Calvin Cycle
• Occurs in stroma of chloroplast
• Requires CO2
• Uses ATP and NADPH as fuel to run
• Makes glucose sugar from CO2 and Hydrogen
PHOTOSYNTHESIS
• What affects photosynthesis?
– Light intensity: as light increases, rate of
photosynthesis increases
PHOTOSYNTHESIS
• What affects photosynthesis?
– Carbon Dioxide: As CO2 increases, rate of
photosynthesis increases
PHOTOSYNTHESIS
• What affects photosynthesis?
– Temperature:
• Temperature Low = Rate of photosynthesis low
• Temperature Increases = Rate of photosynthesis
increases
• If temperature too hot, rate drops
Do you have any questions?
• Thank you for attention!
Іntroduction to plant photosynthesis.ppt
