Three Isolated Populations of a Single Species Have Different Histories

question 143

Multiple Choice

Three isolated populations of a single species have different histories: population A recently suffered damage from a virus; population B was recently exposed to an herbivorous caterpillar, L. sexta; and population C had no recent exposure to pathogens or herbivores. All three populations are now free of pathogens and herbivores and have the same total biomass. You decide to do an experiment in which you introduce L. sexta into all three populations. How do you expect the three populations to respond?

• A)All three populations will suffer the same level of damage.
• B)Plant biomass will be highest in B, then A, and lowest in C.
• C)Plant biomass will be highest in B, then C, and lowest in A.
• D)Plant biomass will be highest in B, and about the same in C and A.

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