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Download Energy for Life: Photosynthesis, Respiration, and Fermentation
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Energy for Life: Photosynthesis, Respiration, and Fermentation Chloroplasts • The green oval-shaped structure that gives plants their green color. • It is found within the cytoplasm. • It function to capture energy from the sun to produce food (glucose) for the cell. Photosynthesis • The process of changing light energy into chemical energy. • Energy is stored as food, also known as glucose. • Photosynthesis occurs in plants and some algae. • Plants need light energy, carbon dioxide, and water. Photosynthesis • This process takes place in the chloroplasts, using chlorophyll, the green pigment in plants. • The chemical equation for photosynthesis is: 6 CO2 + 6 H2O → C6H12O6 + 6 O2 • Click on the following link to see an illustration of photosynthesis: http://www.phschool.com/science/biology_place/biocoach/photosynth/overview. html Mitochondria • Looks like a kidney-bean shaped organelle. • It is found floating in the cytoplasm. • It functions as the “power-house” because it changes energy stored in food compounds into a useful form of energy. Respiration • Using oxygen to break down glucose molecules to release energy. • This process is also known as cellular respiration. • There are two stages to respiration: – The 1st stage takes place in the cytoplasm. – The 2nd stage takes place in the mitochondria. • The chemical equation for respiration is: C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy Respiration Con’t. • Click on the link below to watch an animation about photosynthesis and respiration: http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration. html Fermentation • The breaking down of glucose without using oxygen. Therefore this process can be described as occurring in the absence of what element? __________ • This process is also known as anaerobic respiration. Fermentation Con’t. • There are two types of fermentation: – Alcoholic: produces alcohol, energy, and CO2 • Occurs when bread is being baked. – Lactic-Acid: produces energy and lactic acid. • Occurs during a very fast run.
