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Unformatted text preview: Chapter 4 Energy (130-142) 4.5 Where does plant matter come from? Photosynthesis: the big picture- Plants capture carbon dioxide gas (CO2) from the air by using energy provided by the sunlight along with water and small chemicals- Plants, not the only organisms capable of photosynthesis- Bacteria and unicellular organisms- 3 inputs to the process 1. light energy 2. carbon dioxide 3. water- From inputs plants produce sugar and oxygen-Photo: Light is captured, energy is temporarily stored- Synthesis: Sugar is synthesized 4.6 Photosynthesis takes place in the chloroplasts- Leaves are green b/c cells near the surface are packed with chloroplasts- Chloroplasts : light harvesting organelles found in plants cells, and make it possible for plants to use the energy from the sunlight to make sugars- Most are found in leaves- May be found in stems- Filled with a fluid called the stroma- Thykaloids float around the stroma that is a system of interconnected membranous structures, and look like a stack of pancakes- The photo part of photosynthesis occurs inside the thykaloids- The synthesis part of photosynthesis occurs within the stroma- Chlorophyll: Special molecule found in chloroplasts that makes the capture of light energy possible 4.7 Light energy travels in waves: plant pigments absorb specific wavelengths- Sunlight is light energy- Photosynthesis is powered by light energy- Light Energy : a type of kinetic energy made up of little energy packets called photons- Photons : organized into waves, bombard surfaces- Photons- Lots of energy- The length of the wave corresponds to the amount of energy is being carried- The shorter the wave, the move energy the light carries- Electromagnetic Spectrum : Range extending from extremely short high-...
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