ACT Science OG Test 2 - Passage II

Questions 7-13 are based on the following passage.

Heliconia metallica is a plant found in the understory of tropical rain, forests. (The understory is the area below the forest canopy.) H. metallica flowers are normally polli­nated by hummingbirds. The flowers can be self-pollinated (egg and pollen are from the same H. metallica plant) or cross-pollinated ( egg and pollen are from different H. metallica plants). The following study was conducted to investigate the effects of different pollination treatments on fruit production and seed mass in a population of H. metallica.


Before pollination could occur, the anthers (pollen­producing structures) were removed from each of 400 H. metallica flowers. Then, the flowers were covered with nylon bags to prevent the normal pollinators from pollinating the flowers. The covered flowers were divided equally into 4 groups (Groups 1-4), and each group received a different pollination treatment (see Table 1). Four weeks after the pollination treatments, the percent of flowers that produced fruit and the average mass per seed were determined for each group (see Figures 1 and 2, respectively).

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Question 7 The data that were averaged to produce the results shown in Figure 2 were most likely collected using which of the following pieces of equipment?