7 An Overview of Photosynthesis - An Overview of...

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An Overview of Photosynthesis Photosynthesis is the process that captures light energy and transforms it into the chemical energy of carbohydrates It occurs in the Plasma membranes of some bacteria Cells of algae Leaves of plants
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Journey into a leaf
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Journey into a leaf
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Photosynthesis takes place in three stages: 1. Capturing energy from sunlight 2. Using energy to make ATP and NADPH 3. Using ATP and NADPH to power the synthesis of carbohydrates from CO 2 Light-dependent reactions Light-independent reactions The Calvin cycle carbon dioxide + water + Light energy glucose + oxygen + water
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All three stages occur in the chloroplast Journey into a leaf (continued) Contain the pigment chlorophyll, which captures light
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How Plants Capture Energy from Sunlight Light consists of tiny packets of energy called photons Sunlight contains photons of many energy levels High energy photons have lower or shorter wavelength than low energy photons The full range of these photons is called the electromagnetic spectrum
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Photons of different energy: the electromagnetic spectrum
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Are molecules that absorb light energy The pigment in human eyes is retinal Absorption: ~ 380 (violet) 750 (red) nm The main pigment in plants is chlorophyll Chlorophyll a and chlorophyll b
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