The effect of Herbicides on photosynthesis

The effect of Herbicides on photosynthesis - Distance( cm)...

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Joshua Sipe Biology104 SectionM01 March 4, 2008 Title : The Effect of Herbicides on Photosynthetic Rate Abstract: The objective of this lab was to measure the photosynthetic rate of spinach leaves while under the influence of barium chloride. The spinach leaves were placed in two separate petri dishes. One petri dish contained a 1.0 percent sodium bicarbonate solution as the control and the other was placed in a solution of sodium bicarbonate and barium chloride. The spinach leaves were placed 50cm, 25cm and 10cm away from the light source. After testing the effect of barium chloride on the photosynthetic rate of spinach leaves it was found that sodium bicarbonate severely restricts photosynthesis. Hypothesis: Barium chloride will prevent photosynthesis Procedure : The basis for this experimental procedure is outlined in Lab Manual Biol104 (Morris,TC3,2008) pg. 74 Data: Figure. 1 Photosynthetic rate of spinach leaves Distance( cm) Soluti on Floating spinach leaves 50cm NaCO 3 4 25cm NaCO 3 5 10cm NaCO 3 7 Figure. 2 Photosynthetic rate of spinach leaves with barium chloride
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Unformatted text preview: Distance( cm) Solution Floating spinach leaves 50cm NaCO 3+ B 1 aCl 25cm NaCO 3+ BaCl 1 10cm NaCO 3+ BaCl 1 Using sodium bicarbonate for the first test four spinach leaves floated to the surface at 50cm, 5 spinach leaves floated to the surface at 25cm and 7 spinach leaves floated to the surface at 10cm (figure 1). Using a solution consisting of sodium bicarbonate and barium chloride the rate of photosynthesis seemed to stop only allowing one spinach leaf to float to the surface (figure 2). Conclusion: The hypothesis was not supported by the experimental data. The hypothesis was not supported because photosynthesis did not stop completely allowing one spinach leaf to rise to the surface as a result of the production of oxygen. Herbicides do however limit photosynthesis greatly only allowing a small amount of photosynthesis. With barium chloride the proximity to the light source did not matter....
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The effect of Herbicides on photosynthesis - Distance( cm)...

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