Spinach Lab Report

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ESS PLANNING LAB 3 Research Question: How does light intensity affect the rate of photosynthesis of green spinach leaves? Background: Spinach leaf disc normally float but the spinach discs will be filled with fluid by using a syringe (explained in method), once they are filled it affects the buoyancy of the spinach disc causing them to sink. Photosynthesis uses light energy to convert carbon dioxide and water into glucose and oxygen. When photosynthesis occurs in the leaf disc oxygen will be released causing the discs to float again. The leaf disc is also participating in respiration, which would use some of the oxygen, when the leaf does float it is because the net result is more oxygen produced by photosynthesis then absorbed by cellar…show more content…
Person taking the time The same person will use the stop watch, this is because if they were to make and error this error would need to be continuous throughout the whole lab Type of water used The water used will be distilled Evian water this will insure that the type of water remains a constant. Lighting in the class room The lights in the classroom will be turned off to insure the only light energy the plants receive is from the lamp in the experiment. Same light intensity meter and same stop watch The same light intensity meter and same stopwatch will be used through out the lab. This is because if there is an error with the equipment that error is bested controlled by remaining constant for all the trials. Method for measuring light intensity (add to method) The light intensity will be measured at the same spot on the cup each time. This location will be on the directly in front of the closest rim of the cup to the lamp. Materials: • 1 package of baking soda • 1 bottle liquid soap • 5 clear plastic

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