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Q27 - Reciprocal Intraguild Predation Between Juveniles and Adults

Theoretical 2 Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license
Coevolution & Species Interactions

Intraguild predation is the killing and sometimes eating of potential competitors. Reciprocal intraguild predation with size structure, is one type of intraguild predation where both consumers feed on each other’s juveniles. In this case, P1 has piercing-sucking type mouthparts, and P2 has chewing type mouthparts. In the figure below “R” represents resource, “P” represents (reciprocal) intraguild predator, “j” represents juveniles and “a” represents adults.

Figure 1. Figure 1.

Using the information and data, determine which of the statements are true or which are false.

A. If P1j population increases, then P2a will produce more eggs.
B. If P2j population decreases, then P2a population will increase in next generation.
C. If R increases, then P2a doesn't feed on P1j.
D. If R decreases, then P2a population will increase in next generation.
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Question reproduced from IBO 2018, Theoretical Paper 2, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)