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Photosynthesis Index

Classifying organisms according to their carbon source and energy supplies
Photosynthesis : The Development of Ideas
The light dependent reaction
The light dependent reaction : Summary
Chlorophyll in the chloroplast
Carbon fixation : The light independent reaction
Photosynthesis overview

Topic Chapters Index

 

Remember:

Oxidation Is a Loss of electrons (OIL)
Reduction Is a Gain of electrons (RIG)

PHOTOSYNTHESIS

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Chlorophyll and photosynthesis

Pigments in the leaves of green plants and algae

Chlorophyll pigments 

 

The fluorescence of chlorophyll

The fluorescence of chlorophyll 

Fluorescence: The excitement of an electron to a high energy level by the action of light energy. Followed by the release of that energy as light again as the electron falls back to its former low energy level.

Something must be happening in the chloroplast to capture these electrons and use their energy.

Free electrons can lead to OXIDATION AND REDUCTION reactions.

When compounds are oxidised energy is released.

If this release of energy is COUPLED to biological reactions then WORK can be done.

Similarly when compounds are reduced, energy has to be put into the system.

In photosynthesis the source of electrons for reducing

CO2 CH2O is water and the source of energy is light.

 

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