ch. 4.2 photosynthesis. i. the nature of light a. the sun is the source of energy on earth. 1. the...
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Ch. 4.2
Photosynthesis
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I. The Nature of Light
• A. The Sun is the source of energy on Earth.• 1. The light you see is white light.• 2. Light passing through a prism appears: red, orange, yellow, green, blue and violet as the visible spectrum.
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B. When Light Strikes Objects
• 1. Transmission is when transparent materials allow light to pass through.
• 2. When light hits a shiny surface and light bounces back it’s called reflection.
• 3. Absorption is when dark objects take in light.
• 4. Most objects reflect some colors of the visible light spectrum while they absorb other colors.
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Visible Light Spectrum
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C. Plants and Light
• 1. Plants absorb some colors of the visible spectrum and reflect others.
• 2. When light strikes the green leaves of a plant, most of the green part of the spectrum is reflected.
• 3. Most of the other colors are absorbed.
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Reflect, Absorb, Transmit
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D. Plant Pigments
• 1. When light strikes a leaf, it is absorbed by the pigments found in the leaf’s cells.
• 2. Chlorophyll is the most abundant pigment in leaves.
• 3. Chlorophyll absorbs blue and red light and reflects green light.
• 4. Accessory pigments are also found in plants include orange and yellow pigments.
• 5. Most accessory pigments are hidden by the chlorophyll.
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Plant Pigments
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II. The Photosynthesis Process
• A. Part 1 of Photosynthesis the Plant captures Energy from the Sun.
• B. Part 2 of Photosynthesis the Plant uses that energy to produce food.
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C. Capturing Energy
• 1. A substance that absorbs light absorbs energy.
• 2. Photosynthesis begins when light strikes the chlorophyll in a plant’s chloroplasts. This light energy powers the
next stage.
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D. The Chemistry of Photosynthesis
• 1. Plants use Carbon dioxide gas and Water as raw materials for photosynthesis.
• 2. During this stage of photosynthesis, Plants use the energy absorbed by chlorophyll to power a series of complex chemical reactions.
• 3. Plants produce Sugar and Oxygen gas.
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E. The Photosynthesis Equation
• Carbon Dioxide + Water --- Sugar + Oxygen
• CO2 H2O C6H12O6 O2