photo lab report - Melissa Halverson Herbicides Effect of...

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Melissa Halverson Herbicides Effect of Photosynthesis Introduction Herbicides are chemical agents that are used to destroy plants or inhibit their growth. Plants cannot grow without the aid of photosynthesis which provides them with some of the nutrients that are needed to grow. The herbicide that was used in the experiment binds to the electron transport proteins associated with photosystem II. If the herbicide binds to the electron transport proteins than the electrons cannot be transferred to photosystem I and therefore water cannot be oxidize to replace lost electrons that are needed in photosystem I. An experimental system that included a Vernier CO 2 monitor and a heat lamp to stimulate the photosynthesis was used. The plant that was used was duckweed and azolla. These plants were used because they are small plants and this lets observation of the amount of photosynthesis possible. The researchable question that was investigated was, “What effect does herbicide have on the rate of photosynthesis?” The hypothesis was, “ If the concentration of herbicide is increased then the rate of photosynthesis will decrease.” Materials and Methods To test the hypothesis there was five different concentrations of herbicide. Using different concentrations will show if the increased amount of herbicide will have an affect on photosynthesis. In the experiment the concentrations that were used were 0%, 0.2 %, 0.4%, 0.6% and 1%. There were three replications of each dilution and after each exposure to the light; new plants and solution were mixed so that exhausted plants were not used for the second and third
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photo lab report - Melissa Halverson Herbicides Effect of...

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