What ecological term describes the symbiotic relationship between leguminous plants (such as cowpeas) and Rhizobium bacteria inhabiting their root nodules?
Answer and explanation
Correct answer: D. mutualism
- Step 1: Rhizobium bacteria fix atmospheric nitrogen into ammonium for the plant. Step 2. The legume plant supplies the bacteria with carbohydrates and a protected anaerobic nodule environment. Step 3. Both organisms benefit mutually (+/+), defining mutualism. Answer: mutualism. Why not the others: Commensalism benefits only one without harming the other (+/0); parasitism benefits one while harming the host (+/-); amensalism harms one without benefit (0/-).
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