IB Biology SL C4.1.12 Mutualism As Interspecific Relationship Questions

Trace reciprocal benefits in coral–zooxanthellae, squirrel–spruce and root-nodule examples; identify what each species gives and receives.

Exam points

Define mutualism as an interspecific relationship in which both species benefit, and distinguish it from parasitism where only one benefits.
Explain what each partner gives or gains in an example such as coral–zooxanthellae, squirrel–spruce or legume–Rhizobium.

[Maximum number: 3]

Reef-building corals are an association between two organisms: coral polyps and Zooxanthellae.

(a)

State the relationship between Zooxanthellae and coral reef species.

[ 1 ]

(b)

Describe the exchange of materials between the coral's polyps and Zooxanthellae.

[ 2 ]

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