Filamentous photosynthetic algae were placed on a microscopic slide and illuminated with light of different colors as illustrated.
The bacteria that are known to migrate towards the region of high \( O_2 \) were also added uniformly on the slide. Which one of the following options illustrates the distribution of bacteria along the length of the microscopic slide after illumination?
\
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Bacterial migration can be influenced by oxygen concentration, which in turn is affected by the rate of photosynthesis, influenced by the wavelength of light.
Step 1: Understand the bacterial migration.
The bacteria are known to migrate towards the region with higher oxygen concentration. The light of different colors (Blue, Green, Yellow, Red) will likely influence the oxygen concentration in the algae, as certain wavelengths of light will enhance photosynthetic activity and oxygen production.
Step 2: Analyze the options.
- (A) The graph in option (A) shows a peak near the Blue region, indicating that oxygen concentration is highest where the algae are most active in photosynthesis. The bacteria will migrate towards this region, which is consistent with the expected behavior.
- (B) The graph in option (B) shows multiple peaks, which is not expected for a single migration pattern.
- (C) The graph in option (C) shows a peak in the Green region, which would not align with the expected oxygen distribution in the Blue region.
- (D) The graph in option (D) also shows multiple peaks, which is not the expected distribution for a single migration.
Step 3: Conclusion.
The correct option is (A), where the bacterial concentration is highest in the region where the oxygen concentration is also highest.
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