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SCIENCE REASONING TEST 18 Minutes — 18 Questions

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Directions: There are three passages in this test. Each passage is followed by several questions. After reading a passage, choose the best answer to each question and fill in the corresponding oval on your answer sheet. You may refer to the passages as often as necessary. | 4 4 SCIENCE REASONING TEST 18 Minutes 18 Questions Directions There are three passages in this test. Each passage is followed by several questions. After reading a passage choose the best answer to each question and fill in the corresponding oval on your answer sheet. You may refer to the passages as often as necessary. Passage I A series of experiments was performed to study the environmental factors affecting the size and number of leaves on the Cyas plant. Experiment 1 Five groups of 25 Cyas seedlings all from 2-3 cm tall were allowed to grow for 3 months each group at a different humidity level. All of the groups were kept at 75 F and received 9 hours of sunlight a day. The average leaf lengths widths and densities are given in Table 1. Table 1 Table 2 Sunlight hrs. day Average length cm Average width cm Average density leaves cm 0 5.3 1.5 0.32 3 12.4 2.4 0.59 6 11.2 2.0 0.56 9 8.4 1.8 0.26 12 7.7 1.7 0.19 Number of leaves per 1 cm of plant stalk Humidity Average length cm Average width cm Average density leaves cm 15 5.6 1.6 0.13 35 7.1 1.8 0.25 55 9.8 2.0 0.56 75 14.6 2.6 0.61 95 7.5 1.7 0.52 Number of leaves per 1 cm of plant stalk Experiment 2 Five new groups of 25 seedlings all from 2-3 cm tall were allowed to grow for 3 months each group receiving different amounts of sunlight at a constant humidity of 55 . All other conditions were the same as in Experiment 1. The results are listed in Table 2. Experiment 3 Five new groups of 25 seedlings as above were allowed to grow at a constant humidity of 55 for 3 months at different daytime and nighttime temperatures. All other conditions were the same as in Experiment 1. The results are shown in the following table. Table 3 Day Night Temperature F Average length cm Average width cm Average density leaves cm 85 85 6.8 1.5 0.28 85 65 12.3 2.1 0.53 65 85 8.1 1.7 0.33 75 75 7.1 1.9 0.45 65 65 8.3 1.7 0.39 Number of leaves per 1 cm of plant stalk 210 GO ON TO THE NEXT PAGE. 4 4 1. Which of the following conclusions can

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