Question

1.
The bacteria that were added to the soil with the clover plants were Rhizobium bacteria.



Rhizobium bacteria form nodules on the roots of these plants. The bacteria we saw in the previous section provided plants with a usable form of nitrogen. In return the plants provided the bacteria with a source of carbon-compounds they can use as an energy source.



Classify this type of symbiotic relationship.

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Competition (-/-)


Mutualism (+/+)


Parasitism (+/-)


Commensalism (+/0)

Answer 1

Mutualism (+/+)

Both the Rhizobium bacteria and the clover benefit: bacteria get carbon compounds from the plant, and the plant gets usable nitrogen from the bacteria.