photosynthesis. journey into a leaf plant stomata
TRANSCRIPT
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Photosynthesis
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Journey Into a Leaf
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Plant Stomata
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Water and Oxygen
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Overall Equation
Is this a Redox Reaction?
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Overall EquationIs this a Redox Reaction? Yes: electrons are still transferred from one
molecule to another
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Questions About PlantsWhy do plants need water?
Why do they release oxygen?
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Photosynthesis
To answer these questions we must first ask, how can solar light provide energy for plants?
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Photosynthesis
How can solar light provide energy for plants? Shorter the
wavelength the greater the energy
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Solar Radiation
Solar radiation is absorbed by chlorophyll (pigments in the thylakoids)
Why are plant leaves green?
All other colors (wavelengths) are absorbed
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Chloroplast Pigments
Chlorophyll a
Chlorophyll b
Carotenoids
Many others…why?
Why reflect green?
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Photosynthesis
Two Stages Light Reactions Calvin Cycle
You need to know The main purpose of
each stage Where they take
place
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Photon Absorption
What happens when a photon is absorbed by a pigment?
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The Photosystem
Energy (not electrons) is passed from one pigment to the next until it reaches the reaction center
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Making ATP & NADPH
The pigment in the reaction center will give up its excited electron to an electron acceptor
Conversion of light energy to chemical energyWhat can cells do with captured electrons?
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Electron Flow & Potential Energy
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A Familiar Processes
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The Calvin Cycle
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Summary
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Problem with Photosynthesis
Photorespiration When its hot out, stomata
close up…why is this a problem? CO2 can’t get into cell and O2 can’t leave
O2 then enters Calvin Cycle
Sugar production stops because there’s no carbon source
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Photorespiration
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The Oxygen Revolution
Was O2 always part of our atmosphere?
How do we know?
How and when did it happen?
What was the impact?