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White bedstraw naturally lives in alkaline soils, and heath bedstraw naturally lives in acidic soils. Tansley tested whether these closely related species compete and how the might coexist. Schematic results of his experiments are shown below. These esults support that__. Heath bedstraw grown alone White bedstraw grown alone Both species grown Relyea, Ecology, 9e, © 2021 W. H. Freeman and Company

White bedstraw naturally lives in alkaline soils, and heath bedstraw naturally lives in acidic soils. Tansley tested whether these closely related species compete and how the might coexist. Schematic results of his experiments are shown below. These esults support that__. Heath bedstraw grown alone White bedstraw grown alone Both species grown Relyea, Ecology, 9e, © 2021 W. H. Freeman and Company

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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**Investigating Plant Competition: Tansley's Experiment on Bedstraw** White bedstraw naturally lives in alkaline soils, and heath bedstraw naturally lives in acidic soils. Tansley tested whether these closely related species compete and how they might coexist. The schematic results of his experiments are shown below. These results support that ________________. **Diagram Explanation:** This diagram presents four scenarios showing the growth of bedstraw species in different soil conditions. 1. **Heath bedstraw grown alone:** - **Alkaline soil (top left):** Heath bedstraw shows some growth. - **Acidic soil (top right):** Heath bedstraw thrives, indicating favorable conditions. 2. **White bedstraw grown alone:** - **Alkaline soil (middle left):** White bedstraw thrives, which is its natural habitat. - **Acidic soil (middle right):** White bedstraw shows limited growth. 3. **Both species grown together:** - **Alkaline soil (bottom left):** White bedstraw dominates, outcompeting heath bedstraw. - **Acidic soil (bottom right):** Heath bedstraw dominates, outcompeting white bedstraw. **Conclusion:** - The experiment supports that closely related species compete. - When grown together, each species thrived in its native soil type, suggesting competition for optimal growing conditions. **Options:** - [x] Closely related species compete - [ ] Closely related species don’t compete - [ ] Closely related species can co-exist by living on different soil types
Transcribed Image Text:**Investigating Plant Competition: Tansley's Experiment on Bedstraw** White bedstraw naturally lives in alkaline soils, and heath bedstraw naturally lives in acidic soils. Tansley tested whether these closely related species compete and how they might coexist. The schematic results of his experiments are shown below. These results support that ________________. **Diagram Explanation:** This diagram presents four scenarios showing the growth of bedstraw species in different soil conditions. 1. **Heath bedstraw grown alone:** - **Alkaline soil (top left):** Heath bedstraw shows some growth. - **Acidic soil (top right):** Heath bedstraw thrives, indicating favorable conditions. 2. **White bedstraw grown alone:** - **Alkaline soil (middle left):** White bedstraw thrives, which is its natural habitat. - **Acidic soil (middle right):** White bedstraw shows limited growth. 3. **Both species grown together:** - **Alkaline soil (bottom left):** White bedstraw dominates, outcompeting heath bedstraw. - **Acidic soil (bottom right):** Heath bedstraw dominates, outcompeting white bedstraw. **Conclusion:** - The experiment supports that closely related species compete. - When grown together, each species thrived in its native soil type, suggesting competition for optimal growing conditions. **Options:** - [x] Closely related species compete - [ ] Closely related species don’t compete - [ ] Closely related species can co-exist by living on different soil types
**Title: Understanding Competitive Exclusion in Aquatic Plant Species** **Introduction to Competitive Exclusion:** This question explores the principle of competitive exclusion within the context of a stream ecosystem. It examines how two species of aquatic plants that rely on nitrogen and phosphorus as nutrients can coexist or be prevented from doing so. **Scenario:** In a stream ecosystem, two aquatic plant species depend on available nitrogen and phosphorus. The question posed is: Under what conditions would these two species, in competition for these nutrients, be unable to coexist? **Answer Options Explained:** 1. **Option 1:** Both species can persist at equivalent levels of nitrogen and phosphorus. - If both species can tolerate the same conditions, competitive exclusion may still occur if one species uses resources more efficiently. 2. **Option 2:** Both species survive at lower levels of nitrogen but require higher levels of phosphorus. - Similar resource needs can lead to direct competition, but differences in tolerances could influence outcomes. 3. **Option 3:** One species is better able to survive at low nitrogen levels, while the other can survive with low phosphorus. - Distinct resource preferences and tolerances can allow unrelated niche exploitation, potentially facilitating coexistence. 4. **Option 4 (Correct Answer):** One species persists at lower nitrogen levels, while the other requires high levels of both nutrients. - The inability of one species to tolerate varying resource levels prevents it from effectively competing, thereby being excluded. This scenario highlights the complexities of resource competition and its impact on species cohabitation in ecosystem dynamics.
Transcribed Image Text:**Title: Understanding Competitive Exclusion in Aquatic Plant Species** **Introduction to Competitive Exclusion:** This question explores the principle of competitive exclusion within the context of a stream ecosystem. It examines how two species of aquatic plants that rely on nitrogen and phosphorus as nutrients can coexist or be prevented from doing so. **Scenario:** In a stream ecosystem, two aquatic plant species depend on available nitrogen and phosphorus. The question posed is: Under what conditions would these two species, in competition for these nutrients, be unable to coexist? **Answer Options Explained:** 1. **Option 1:** Both species can persist at equivalent levels of nitrogen and phosphorus. - If both species can tolerate the same conditions, competitive exclusion may still occur if one species uses resources more efficiently. 2. **Option 2:** Both species survive at lower levels of nitrogen but require higher levels of phosphorus. - Similar resource needs can lead to direct competition, but differences in tolerances could influence outcomes. 3. **Option 3:** One species is better able to survive at low nitrogen levels, while the other can survive with low phosphorus. - Distinct resource preferences and tolerances can allow unrelated niche exploitation, potentially facilitating coexistence. 4. **Option 4 (Correct Answer):** One species persists at lower nitrogen levels, while the other requires high levels of both nutrients. - The inability of one species to tolerate varying resource levels prevents it from effectively competing, thereby being excluded. This scenario highlights the complexities of resource competition and its impact on species cohabitation in ecosystem dynamics.
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