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Powerpoint Presentation: Photosynthesis Introduction

 

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
Chlorophyll and photosynthesis
Carbon fixation : The light independent reaction
Photosynthesis overview

Topic Chapters Index

 

PHOTOSYNTHESIS

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The Development of Ideas

Blackman: 1920s

   

Experiment 1

Light Intensity v Temperature

 

Experiment 1: Light Intensity v Temperature

Observation

At low light intensities (A) - when light is a limiting factor - temperature has no effect upon photosynthesis.

Therefore Q10 = 1

At high light intensities (B) - when light is not limiting - temperature has an effect upon photosynthesis. The rate doubles for every 10°C rise in temperature

Therefore Q10 = 2

Conclusion

Photosynthesis consists of two reactions

I The Light Dependent Reaction

Photochemical and unaffected by the temperature
(Q10 = 1)

II The Light Independent Reaction (aka "Dark" Reaction)

Enzyme controlled as it has a Q10 » 2

 

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