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Measuring the Light-Dependent Reaction The purpose of this investigation was to determine how various factors affect the light reaction. A student set up the following experiment using a number of leaf disks (cut from a leaf with a hole punch). The student used a syringe to initially remove any gases that were in the leaf tissue. Once the gases were sufficiently removed, the disks sank to the bottom of the beaker. 6.Explain the difference between each of the three rates. 7. Identify the two experimental variables. Explain how the student was able to test two variables yet maintain a controlled experiment. |
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Answer» Plants occupy a fundamental part of the food chain and the carbon cycle due to their ABILITY to carry out photosynthesis, the biochemical process of CAPTURING and storing energy from the SUN and MATTER from the air. At any given point in this experiment, the number of FLOATING leaf disks is an indirect measurement of the net rate of photosynthesis.In photosynthesis, plants use energy from the sun, water, and carbon dioxide (CO2) from the air to store carbon and energy in the form of glucose molecules. Oxygen gas (O2) is a byproduct of this reaction. Oxygen production by photosynthetic organisms explains why earth has an oxygen-rich atmosphere. |
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