
Concept explainers
Why might vascular plants have developed relationships with so many types of microorganisms? These molecular-level interactions show many similarities when microbe-plant and microbe-human interactions are considered. What does this suggest concerning possible common evolutionary relationships?

To determine: The possible reason for the development of relationships with many types of microorganisms by the vascular plants.
Introduction: Aquatic plants have evolved into terrestrial organisms with the help of soil microorganisms. This establishes a plant-microbe relationship. The interaction between plants and microbes may be beneficial for both or for only the microbes.
Explanation of Solution
Vascular plants are the plants that can absorb water through roots and then supply it to their different parts. Vascular plants have developed a relationship with different types of microorganisms as a means of survival. This association of plants with different types of microbes ensures that if one species of microbes perishes, the other microbial species is available to increase the uptake of nutrients and water by the plant.

To determine: The common evolutionary relationships suggested by the similarities in molecular level interactions in microbe-plant and microbe-human interactions.
Introduction: Aquatic plants have evolved into terrestrial organisms with the help of soil microorganisms. This establishes a plant-microbe relationship. The interaction between plants and microbes may be beneficial for both or for only the microbes.
Explanation of Solution
The molecular level plant-microbe and human-microbe interactions show some similarities. This similarity suggests a convergent evolution of these microbes, which means that different microbial species evolved from different ancestors, but they still shared common traits due to similar selection pressures.
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Chapter 31 Solutions
Prescott's Microbiology
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