Which mutualistic symbiotic relationship occurs between nitrogen-fixing Rhizobium bacteria and the root nodules of leguminous plants?
Answer and explanation
Correct answer: B. Mutualism
- Step 1: Rhizobium bacteria fix atmospheric nitrogen into ammonia for the host plant. Step 2. In return, the plant provides carbohydrates and an anaerobic environment (leghemoglobin), benefiting both partners (+/+ interaction, mutualism). Answer: Mutualism. Why not the others: Commensalism benefits one without affecting the other (+/0); Parasitism benefits one while harming the host (+/-); Amensalism inhibits one without benefit (0/-).
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