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.

Question

Figure 2.5 shows the light intensity (LED irradiance) over time for a chamber containing a water hyacinth



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.





Question 1
According to Figure 2.5, the initial photosynthesis-stimulating period lasted approximately:(1 point)
Responses

50 minutes
50 minutes

80 minutes
80 minutes

20 minutes
20 minutes

5 minutes
5 minutes
Question 2
Based on the data in Figures 2.5 and 2.6, which light intensity causes a water hyacinth leaf to absorb carbon dioxide at the fastest rate?(1 point)
Responses

0 μE/m2/s
0 μE/m2/s

300 μE/m2
300 μE/m2

1,000 E/m2/s
1,000 E/m2/s

100 μE/m2
100 μE/m2
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Answer 1

To answer your questions accurately, I would need to view Figures 2.5 and 2.6, which are not provided here. However, I can help guide you on how to interpret the figures if you can describe them or provide key details. Here's how you could approach answering each question based on typical data presentation:

Question 1: To determine the duration of the initial photosynthesis-stimulating period, look for the section of Figure 2.5 where light intensity is constant at 300 μE/m²/s. Measure the time duration from the start of this constant light exposure until the light intensity starts to change. This will give you the approximate duration of the initial period.

Question 2: To identify the light intensity that causes a water hyacinth leaf to absorb carbon dioxide at the fastest rate, examine Figure 2.6. Look for the light intensity levels that correspond to the steepest decline in carbon dioxide concentration over time, as this indicates the fastest rate of absorption. Compare the rates of absorption at the different light intensities provided in your options.

If you can describe the figures or share specific data points, I can provide you with a more precise analysis!