tailieunhanh - 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. | 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 3 6 9 12 Number of leaves per 1 cm of plant stalk Humidity Average length cm Average width cm Average density leaves cm 15 35 55 75 95 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 85 65 65 85 75 75 65 65 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