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Powerpoint Presentation: Photosynthesis Introduction

 

Photosynthesis Index

Classifying organisms according to their carbon source and energy supplies
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

 

At this time the composition of the atmosphere was being revealed and the gases in it were being discovered.

O2

Scheele
and
Priestley

1773

1774

CO2

Black

1777

N2

Rutherford

1772

The composition of air

Lavoisier

1774

 

 

PHOTOSYNTHESIS

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The Development of Ideas

Hales

1727

Plants took their nourishment in part from the atmosphere.
Light energy participated in this process.

Priestley

1771

Green plants "renewed" air that was made "bad" by breathing animals or burning candles
"Renewed" air = oxygen
"Bad" air = carbon dioxide

Ingenhousz

1779

Light is necessary for the production of O2 by plants
("Plants should be removed from the house at night")

Senebier

1782

Plants breathe like animals in the dark

De Saussure

1804

Quantitative measurements of photosynthesis.
Mass gain by plants through growth > Mass of CO2 absorbed - Mass of O2 released
The difference was attributed to water.

Sachs

1864

Observed the growth of starch grains in illuminated chloroplasts.
Classic experiment: Leaf exposed to light with certain parts covered.
In the exposed parts starch was produced
In the covered parts starch was absent.

Therefore:

Engelmann

1894

Experiment 1 : Light, Chlorophyll and Photosynthesis (link opens in new window)
Experiment 2 : Spirogyra filamentous alga + motile oxygen sensitive bacteria (link opens in new window)

Blackman

1920s

Experiment 1: Light Intensity v Temperature (link opens in new window)
Experiment 2: Light Intensity and CO2 Concentration (link opens in new window)

 

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