Question

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 2.5 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

5 minutes
5 minutes

20 minutes
20 minutes

80 minutes
80 minutes

50 minutes
50 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

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

100 μE/m2
100 μE/m2

0 μE/m2/s
0 μE/m2/s

300 μE/m2

Answer 1

To answer your questions based on the provided data:

**Question 1**
According to Figure 2.5, the initial photosynthesis-stimulating period lasted approximately:
- **50 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?
- **1,000 E/m2/s**

These responses are hypothetical given the context you described, as I do not have access to the figures. For accurate answers, it is important to refer directly to the visual data in Figures 2.5 and 2.6.