Photosynthesis
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What is photosynthesis
The conversion of light energy into chemical energy
Stroma
Fluid contains enzymes, starch granules, ribosomes and circular DNA
Thylakoid
Fluid-filled disc with membrane which contain photosynthesis pigments
Lamella
Section of thylakoid membrane which link grana
Light dependant reaction occurs in the..
thylakoid
Light independent reaction occurs in the..
stroma
Endosymbiotic theory
Describes how complex organelles evolved within eukaryotic cells and suggest eukaryotes engulfed ancient prokaryotes and have become endosymbiotic
How does chloroplast structure provide evidence for the endosymbiotic theory
Have their own circular DNA and ribosomes Surrounded by a double membrane Similar size and structure to free-living bacteria Replicate via binary fission
Limiting factors for photosynthesis
Light intensity Temperature Carbon dioxide concentration
Light intensity
At higher light intensities more electrons undergo photoionisation so more reduced NADP and ATP so the calvin cycle can occur at a faster rate Can reach a plateau ( Won’t increase with light intensity anymore )
Temperature
Optimum temperature for enzymes like RuBisCo and ATP sypthase
Carbon dioxide concentration
More CO2 can combine with RuBP during carbon fixation so more GP will be produced for organic compounds