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lab 8 - Objectives Photosynthesis Photosynthesis nourishes...

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Objectives
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Photosynthesis Photosynthesis nourishes almost all of the living world directly or indirectly. Captures light energy from the sun and converts it to chemical energy stored in sugars and other organic molecules Oxygenates our atmosphere
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Any green part of a plant has chloroplasts However, the leaves are the major site of photosynthesis for most plants The color of a leaf comes from chlorophyll , the dominant pigment in the chloroplasts Chlorophyll and the other pigments plays an important role in the absorption of light energy during photosynthesis
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Overall reaction CO 2 + H 2 O + Light Energy C 6 H 12 O 6 + O 2 CO 2 comes from atmosphere H 2 O comes from environment
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The glucose and oxygen are then used for cellular respiration Some O 2 released back into environment 2 Stages of Photosynthesis Light Dependent reaction Light Independent reaction (Calvin Cycle)
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Light Dependent Must take place in the LIGHT H 2 O + ADP + P I + NADP+ In chloroplasts in the presence of light ½ O 2 + ATP + NADPH + H+ Occurs in the thylakoids Requires light energy to form NADPH Uses energy to phosphorylate ADP to ATP These are redox reactions Light intensity (strength) and light quality (wavelength) affect the rate of the reaction
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