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photosynthesis lab

photosynthesis lab - Photosynthesis in Spinach Leaves Sec...

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Photosynthesis in Spinach Leaves Sec #: 414 TA: Eric Francisco Name: Meredith Fulton Date: January 25, 2008 Pledge: This work is solely of my creation. No unauthorized assistance was received in its completion. Signature ______________________________
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Introduction In photosynthesis, plant cells convert light energy into chemical energy that is stored in sugars and other organic compounds. Critical to the process is chlorophyll, the primary photosynthetic pigment in chloroplasts. The light absorption part takes place in the thylakoid membrane of the chloroplasts. Simultaneously, the carbohydrate production takes place in the stroma. The equation for photosynthesis is as follows: H 2 O + CO 2 + light (CH 2 0) + O 2 In the light reactions of photosynthesis, light energy excites electrons in plant pigments such as chlorophyll, and boosts them to a higher energy level. A pigment is any substance that absorbs light. The color of the pigment comes from the wavelengths of light reflected (in other words, those not absorbed). Chlorophyll, the green pigment common to all photosynthetic cells, absorbs all wavelengths of visible light except green, which it reflects to be detected by our eyes. Chlorophyll is a complex molecule. Several modifications of chlorophyll occur among plants and other photosynthetic organisms. All photosynthetic organisms (plants, protistans etc.) have chlorophyll a. Accessory pigments absorb energy that chlorophyll a does not absorb. Accessory pigments include chlorophyll b, xanthophylls, and carotenoids (such as beta-carotene). Chlorophyll a absorbs its energy from the Violet-Blue and Reddish orange-Red wavelengths, and little from the intermediate (Green-Yellow-Orange) wavelengths. As shown in the Hill reaction, choloroplasts in water operate in light and release oxygen. The equation that Robert Hill produced upon these findings is as stated below:
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photosynthesis lab - Photosynthesis in Spinach Leaves Sec...

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