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The test contains 25 multiple-choice questions completed within 40 minutes, with guidance on reading passages, selecting one best option, and marking answers on the answer sheet. 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All rights reserved. PSI, the PSI logo and HISET are registered trademarks of PSI Services LLC.  \nScience  \nDirections  \n\n| Time – 40 minutes | 25 Questions |\n| --- | --- |\n\nThis is a test of your skills in analyzing science information. Read each question and decide which of the four options best answers the question. Then mark your choice on your answer sheet. Sometimes several questions are based on the same material. You should carefully read this material and then answer the questions.  \nWork as quickly as you can without becoming careless. Do not spend too much time on any question that is difficult for you to answer. Instead, skip it and return to it later if you have time. Try to answer every question even if you have to guess.  \nMark all your answers on the answer sheet. Give only one answer to each question.  \nIf you decide to change one of your answers, be sure to erase the first mark completely.  \nBe sure that the number of the question you are answering matches the number of the row of answer choices you are marking on your answer sheet. The answer sheet may contain more rows than you need.  \nQuestions 1 through to 5 refer to the following information.  \nBeaver Dam  \nBeavers are large rodents. They are herbivores that feed on tree bark, grasses, and water plants. They use their sharp incisors to chop down trees to make a dam over streams, rivers, or creeks. The dam creates a small pond upstream. In the middle of the pond, beavers make a small island using tree branches and mud, generally called a beaver lodge. The lodge (Image 1), with an underwater entrance and exit, is home to the beaver family.  \nBeavers change their habitat, which has an impact on the ecosystem of the area. To study the impact of beavers on the environment, scientists introduced a male and a female beaver in a fenced three-hectare region in 2011 and closely monitored them for six years. Image 2 shows the region before and after the introduction of the beavers.  \nThe scientists collected water samples from above the beavers’ pool and downstream to check for nutrients in the samples after storms. Table 1 shows the average amount of sediments, nitrogen, and phosphate in the collected water samples.  \nTable 1  \n\n|  | Above Beavers’ Pool | Downstream |\n| --- | --- | --- |\n| Sediments (mg/L) | 120 | 50 |\n| Nitrogen (mg/L) | 3.2 | 2.0 |\n| Phosphate (mg/L) | 1.0 | 0.2 |\n\n1    \nThe warm and moist environment of a beaver’s stomach is home to microorganisms which help it digest the cellulose in the wood they feed on. Which statement correctly explains the type of interaction shared by the beaver and the microorganisms?  \nA. Parasitism, as the microorganisms live inside the beaver and feed on the food consumed by it.  \nB. Commensalism, as the beaver benefits while the microorganisms are unharmed in the interaction.  \nC. Mutualism, as the microorganisms are getting space and nutrients while helping the beaver.  \nD. Competition, as the beaver and the microorganisms depend on the wood consumed by the beaver.  \n2    \nNearly 80% of the trees chopped down by beavers are mainly located up to 10 m from the stream, and most of the chopped trees have a diameter of less than 10 cm. The percentage of chopped trees decreases with increased distance from the stream. Which statement explains how the felling of trees by beavers causes a major change to the habitat?  \nA. It removes the tree canopy that acts as a windbreak, increasing the rate of wind erosion.  \nB. It restricts the growth of native plants, helping invasive plant species to takeover.  \nC. It reduces the vegetation in and around the stream, resulting in the formation of a desert-like habitat.  \nD. It allows more sunlight","cbCaiqRppFkWXXkZ","https://ap.wps.com/l/cbCaiqRppFkWXXkZ","pdf",948717,31,"English","# Directions\n# Questions 1-5: Beaver Dam Information\n# Questions 6-10: Frog Temperature Information","[{\"question\":\"How much time and how many questions are included in this Science practice test?\",\"answer\":\"The test allows 40 minutes to answer 25 multiple-choice questions.\"},{\"question\":\"What do Questions 1 through 5 focus on?\",\"answer\":\"They refer to information about beaver dams, including habitat changes, ecological effects, and data shown in Table 1.\"},{\"question\":\"What is the recommended approach for difficult questions during the test?\",\"answer\":\"Answer as quickly as you can without careless mistakes; if a question is difficult, skip it and return later if time allows, and try to answer every question even if you must guess.\"}]","Science - Free Half-Length Practice Test - FPT8 | PDF",78]