A study of woodpeckers compared the woodpecker population in two sites: a managed forest in which dead trees over ten feet tall and undergrowth were removed, and the control site in which dead treed and undergrowth were allowed to remain. The woodpecker population in the control site was 1000, while in the managed forest the woodpecker population totaled 100. Potential food sources were identical in both sites. Woodpecker nests in the control site were hollowed-out holes fifteen feet above the ground in dead trees. When undergrowth was allowed to remain in the managed forest, no change was observed in the woodpecker population. When artificial 'dead' trees with hollowed-out holes fifteen feet above ground were added to the study site, the woodpecker population doubled. Which of the following can be concluded from this study?

MCQs on the interactions among organisms and their environment that influence and regulate population size. Covers forms of intrinsic population growth and factors affecting that growth, ecological relationships, and the means through which populations can be managed to maintain species and biodiversity.