IB Biology SL 4.1.14 Tests for interspecific competition Question Bank

Practise IB Biology SL 4.1.14 by using population evidence to identify competition and competitive exclusion between species.

Exam points

Identify competition when two species share limited resources and their populations are reduced together.
Interpret population trends to explain competitive exclusion or resource competition.

[Maximum number: 1]

Caenorhabditis elegans and Caenorhabditis briggsae are two species of nematode that co-exist in rotting plant material. A study was conducted in France to determine the relative population of each species in samples of apples.

Figure for Question C4.1.14—Tests for interspecific competition question 1 — IB Biology SL

Suggest, with a reason, the type of interaction that may exist between the two nematodes.

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C4.1.14—Tests for interspecific competition question 1