Question:1.Review the graphs carefully. Based on the information in Figures 2.5 and 2.6, explain the relationships between LED irradiance and carbon dioxide concentration over time for a chamber containing a water hyacinth. Use the evidence from the graphs and your knowledge of science to support your answer.
he leaves of green plants use the energy in sunlight to convert atmospheric carbon into organic carbon through the reactions of photosynthesis. These reactions can be summarized by the following equation:
Gas exchange between the leaf and the environment is an integral part of the photosynthesis reactions. As carbon dioxide enters the leaf, the oxygen produced as a by-product of photosynthesis is released into the environment in a 1:1 ratio. Enclosing a leaf within a lighted chamber allows for the rate of this exchange, and therefore the rate of photosynthesis, to be measured.
Students in a biology class used lighted chambers to measure the photosynthetic rate of leaves from four common plant species: sunflower, water hyacinth, rhoeo, and pothos. A leaf was placed inside the chamber, and a flow of air was introduced. Sensors within the chamber recorded data on light intensity (LED irradiance), carbon dioxide concentration, air temperature, and relative humidity.
The leaf was initially exposed to a constant light intensity of 300 μE/m2/s to stimulate photosynthesis. After this initial period, students incrementally increased the light intensity to investigate the relationship between light intensity and photosynthetic rate.
Figure 2.5 shows the light intensity (LED irradiance) over time for a chamber containing a water hyacinth.
Figure 2.6 shows the change in carbon dioxide concentration over time for a chamber containing a water hyacinth.
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