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arc_easy | arc_easy | Question: Which factor will most likely cause a person to develop a fever?
Answer: | a bacterial population in the bloodstream | train |
arc_easy | arc_easy | Question: Lichens are symbiotic organisms made of green algae and fungi. What do the green algae supply to the fungi in this symbiotic relationship?
Answer: | food | train |
arc_easy | arc_easy | Question: When a switch is used in an electrical circuit, the switch can
Answer: | stop and start the flow of current. | train |
arc_easy | arc_easy | Question: Which of the following is an example of an assistive device?
Answer: | contact lens | train |
arc_easy | arc_easy | Question: Rocks are classified as igneous, metamorphic, or sedimentary according to
Answer: | how they formed | train |
arc_easy | arc_easy | Question: A chewable calcium carbonate tablet is a common treatment for stomach discomfort. Calcium carbonate is most likely used as this type of medicine because calcium carbonate
Answer: | neutralizes digestive acid. | train |
arc_easy | arc_easy | Question: Which two body systems are directly involved in movement?
Answer: | muscular and skeletal | train |
arc_easy | arc_easy | Question: Which change in the state of water particles causes the particles to become arranged in a fixed position?
Answer: | freezing | validation |
arc_easy | arc_easy | Question: Earth's core is primarily composed of which of the following materials?
Answer: | iron | train |
arc_easy | arc_easy | Question: Which of the following events during meiosis contributes most to the variation within a species?
Answer: | segregation of alleles | train |
arc_easy | arc_easy | Question: Which of the following was probably most important in the formation of dark, fertile soil that is good for farming?
Answer: | plant decomposition | train |
arc_easy | arc_easy | Question: When igneous rock is changed into metamorphic rock, which form of energy is this process?
Answer: | heat | train |
arc_easy | arc_easy | Question: In humans, the digestion process begins in
Answer: | the mouth, with chewing and saliva. | train |
arc_easy | arc_easy | Question: Which of these items contains only a solution?
Answer: | a bottle of juice | train |
arc_easy | arc_easy | Question: Many natural rock formations change color over time. In Utah, for example, iron oxidized and formed red, orange, and yellow rock. Which of the following is the cause of this change?
Answer: | chemical weathering | train |
arc_easy | arc_easy | Question: A population of small, plant-eating beetles lives in a forest. About half of the beetles are light brown and the others are dark green. If years of drought cause the area to become dry with few trees, what would the beetle population most likely look like after several generations?
Answer: | It would be mostly light brown beetles. | train |
arc_easy | arc_easy | Question: A scientist wanting to document a change in a river's flow pattern should observe a river over a period of
Answer: | years. | validation |
arc_easy | arc_easy | Question: Automobile engines built today are designed to be gas efficient. Gas-efficient engines most likely affect a city by reducing
Answer: | air pollution. | train |
arc_easy | arc_easy | Question: A student in an empty classroom shouts, "Hello!" Which best explains what the student hears after the shout?
Answer: | a reflection of sound | train |
arc_easy | arc_easy | Question: Which type of energy in gasoline is transformed into mechanical energy in a motorcycle engine?
Answer: | chemical | train |
arc_easy | arc_easy | Question: A student standing near a campfire feels warmer as the fire grows. Which process most likely transfers heat from the campfire to the student?
Answer: | radiation | train |
arc_easy | arc_easy | Question: In snapdragon plants, red flowers are dominant to white flowers. When red-flowered plants are crossed with white-flowered plants, pink flowers are produced. If a researcher wants to produce plants with only white flowers, what color should the parent plants be?
Answer: | both white | train |
arc_easy | arc_easy | Question: Scientists use the term "light year" to describe
Answer: | the distance light travels in one year. | train |
arc_easy | arc_easy | Question: Plate movement can form different features on Earth. The movement of tectonic plates can be both a constructive and a destructive force. At which type of plate boundary is new crust formed?
Answer: | divergent | train |
arc_easy | arc_easy | Question: Which group of organisms can show significant trait changes in the shortest period of time?
Answer: | bacteria | train |
arc_easy | arc_easy | Question: Peach trees have sweet-smelling blossoms and produce rich fruit. What is the main purpose of the flowers of a peach tree?
Answer: | to attract bees for pollination | train |
arc_easy | arc_easy | Question: A group of students are researching changes in climate in their region. Which of these would best provide evidence of changes in temperature and rainfall over a period of years?
Answer: | tree rings | validation |
arc_easy | arc_easy | Question: Which of these would help to prevent infections from occurring in small cuts and scrapes?
Answer: | wash the area with warm, soapy water | train |
arc_easy | arc_easy | Question: Which best describes why winds at the beach change direction between day and night?
Answer: | because the temperatures over land and over water change | train |
arc_easy | arc_easy | Question: Soil erosion can be best prevented by
Answer: | building terraces into the sides of a slope. | train |
arc_easy | arc_easy | Question: Which of the following properties provides the BEST way to identify a mineral?
Answer: | hardness | train |
arc_easy | arc_easy | Question: Which sequence represents the order of development for many plants?
Answer: | seed develops inside fruit -> seed is dispersed -> seed germinates -> plant grows | train |
arc_easy | arc_easy | Question: When ice cream is left out of a freezer, the ice cream changes from a ___.
Answer: | solid to a liquid | validation |
arc_easy | arc_easy | Question: Which equipment will best separate a mixture of iron filings and black pepper?
Answer: | magnet | train |
arc_easy | arc_easy | Question: Which characteristic is shared by all cells?
Answer: | They need energy. | train |
arc_easy | arc_easy | Question: On a small, isolated island, a hurricane destroyed all the trees that produced a large, hard-shelled nut. Which bird population would most likely decrease?
Answer: | birds with thick, strong beaks | train |
arc_easy | arc_easy | Question: A cow and a frog have similar bone structures in their forelimbs. Both have phalanges, radius, ulna, and humerus bones. However, the cow and frog are animals with very different life cycles from each other. Which most likely describes why the body structures of these animals are so similar?
Answer: | Both descended from a common ancestor. | train |
arc_easy | arc_easy | Question: A cell that is unable to import substances required to process chemical energy is most likely a result of a malfunctioning
Answer: | cell membrane. | train |
arc_easy | arc_easy | Question: Which best describes all unicellular organisms?
Answer: | Every cell performs all life functions. | train |
arc_easy | arc_easy | Question: When a transverse wave passes from right to left through a medium, what happens to the particles of the medium?
Answer: | Particles move back and forth perpendicular to the wave. | train |
arc_easy | arc_easy | Question: Which characteristic below most likely accounts for our limited knowledge of galaxies?
Answer: | their great distance from Earth | train |
arc_easy | arc_easy | Question: Decomposers increase the fertility of the soil and prevent dead organisms from building up in the environment. In which way do decomposers make the soil more fertile?
Answer: | by adding nitrogen | train |
arc_easy | arc_easy | Question: When oxygen combines with hydrogen, which substance is formed?
Answer: | water | validation |
arc_easy | arc_easy | Question: When plants undergo photosynthesis, a reaction produces sugar, oxygen, and water. During respiration, stored energy from the products of photosynthesis is converted to usable energy. In what form is the energy stored prior to use in respiration?
Answer: | chemical energy | train |
arc_easy | arc_easy | Question: Which of the following is a typical example of a unicellular organism?
Answer: | bacteria | train |
arc_easy | arc_easy | Question: Over geologic time, global mean sea level has varied significantly. Which change is most likely responsible for an increase in global mean sea level?
Answer: | melting of polar ice caps | train |
arc_easy | arc_easy | Question: Which body system is most responsible for the removal of waste?
Answer: | excretory system | validation |
arc_easy | arc_easy | Question: In which environment is white fur color an advantage for survival?
Answer: | arctic tundra | validation |
arc_easy | arc_easy | Question: Which of these will best separate iron filings from sand?
Answer: | a magnet | train |
arc_easy | arc_easy | Question: Which of these is the chemical symbol for magnesium?
Answer: | Mg | train |
arc_easy | arc_easy | Question: Which of the following is most likely to lead to error in an experiment?
Answer: | bias | train |
arc_easy | arc_easy | Question: Which best describes transportation technology?
Answer: | a system that is used to move people and products | train |
arc_easy | arc_easy | Question: In a gasoline-powered car, chemical energy from gasoline is transformed to make the car move. The motion of the car is what form of energy?
Answer: | mechanical energy | train |
arc_easy | arc_easy | Question: Which characteristic is affected by interactions with the environment?
Answer: | weight | train |
arc_easy | arc_easy | Question: Which is the greatest impact humans have had on the carbon cycle?
Answer: | burning fossil fuels | train |
arc_easy | arc_easy | Question: The floating arrow on a compass always points towards the
Answer: | north. | train |
arc_easy | arc_easy | Question: Which color shirt will reflect the most light on a hot, sunny day?
Answer: | white | train |
arc_easy | arc_easy | Question: A 10 g sample of aluminum and a 10 g sample of iron were each heated by 100 joules of energy. The temperature of the aluminum sample rose 11°C, while the temperature of the iron sample increased 23°C. Which statement best accounts for these results?
Answer: | The specific heat of iron is less than that of aluminum. | validation |
arc_easy | arc_easy | Question: If its food supply in a field decreases, the mouse population in that field will probably
Answer: | decrease. | train |
arc_easy | arc_easy | Question: Overuse of soil for farming causes local disruptions of several Earth subsystems. Which of these is a part of the biogeochemical cycle that experiences the most severe local disruption?
Answer: | cycling phosphorus into the soil | train |
arc_easy | arc_easy | Question: Which of the following is an example of a physical change but not a chemical change?
Answer: | A water pipe freezes and cracks on a cold night. | train |
arc_easy | arc_easy | Question: While conducting an investigation on refraction, a teacher uses a red laser pointer to show how a beam of light is affected as it passes through several glass objects. The teacher should make sure that the
Answer: | beam of light does not travel toward the students. | train |
arc_easy | arc_easy | Question: One student wrote a report about an investigation in which fertilizer was added to tomato plants. Which information from that student's report would most help a second student repeat the investigation?
Answer: | the amount of fertilizer added | train |
arc_easy | arc_easy | Question: A student wants to look under a heavy rock. Which simple machine would be BEST to use to lift the rock?
Answer: | Lever | train |
arc_easy | arc_easy | Question: Rust is a compound with the formula Fe_{2}O_{3}. Which elements combine to form rust?
Answer: | iron and oxygen | train |
arc_easy | arc_easy | Question: The chemical equation below shows a reaction of copper (Cu) with silver nitrate (AgNO_{3}) yielding silver (Ag) and copper(II) nitrate (Cu(NO_{3})_{2}) Cu + 2AgNO_{3} -> 2Ag + Cu(NO_{3})_{2} Silver and copper(II) nitrate are called the
Answer: | products. | train |
arc_easy | arc_easy | Question: What role does the centromere play in cellular reproduction?
Answer: | It is the area of attachment for chromatids. | train |
arc_easy | arc_easy | Question: If 1 kg of the compound toluene melts at -95°C, then 500 g of toluene will
Answer: | melt at -95°C. | train |
arc_easy | arc_easy | Question: A calculation based on the chemical energy of gasoline shows that a car should be able to go 100 miles on a gallon of fuel. When the car was driven on a test track, the car only went 25 miles on a gallon of fuel. What accounts for most of the difference?
Answer: | the waste heat from the combustion of fuel in the engine | train |
arc_easy | arc_easy | Question: A student wants to find the relationship between the diameter of several plastic disks and the circumference of each disk. Which of these types of graphs should be constructed to determine this relationship?
Answer: | line graph | train |
arc_easy | arc_easy | Question: When light is bounced off a mirror, the light is
Answer: | reflected. | train |
arc_easy | arc_easy | Question: Which of the following sentences best explains what happens when puddles evaporate?
Answer: | The water changes from one form to another. | train |
arc_easy | arc_easy | Question: Plants on hills keep dirt in place during a rain storm. Plant roots grow into the dirt and keep the dirt from moving. Why do roots grow into the dirt?
Answer: | to absorb nutrients | train |
arc_easy | arc_easy | Question: In animal skin tissue, cell division is responsible for
Answer: | growth and repair | train |
arc_easy | arc_easy | Question: Which process drives most of the ATP synthesis in a chloroplast?
Answer: | flow of protons across an electrochemical gradient | train |
arc_easy | arc_easy | Question: Which of the following is most consistent with the modern theory of evolution?
Answer: | Parents pass their physical traits to their offspring; those offspring with traits that help them survive in the environment are able to reproduce. | train |
arc_easy | arc_easy | Question: Felicia investigated whether water color affected how fast the water heated in sunlight. She poured tap water into five beakers and placed food coloring in four out of the five beakers. Felicia then used a thermometer to measure the temperature of the water in each of the beakers. Which of these was used as control in her investigation?
Answer: | testing the beaker of uncolored tap water | train |
arc_easy | arc_easy | Question: One process in the formation of sedimentary rocks is when rocks are
Answer: | broken up and deposited in layers. | train |
arc_easy | arc_easy | Question: Western coral snakes have a striped color pattern and are poisonous. Arizona mountain king snakes look like western coral snakes but are not poisonous. The color pattern of the Arizona mountain king snake is an example of
Answer: | mimicry. | train |
arc_easy | arc_easy | Question: Which plant trait is inherited?
Answer: | the shape of its leaves | train |
arc_easy | arc_easy | Question: A student put 200 milliliters (mL) of water into a pot, sets the pot on a burner, and heats the water to boil. When the pot is taken off the burner, it contains only 180 milliliters (mL) of water. What happened to the rest of the water?
Answer: | It turned into water vapor. | train |
arc_easy | arc_easy | Question: Howie put his plants under a plant light. What was he helping his plants do by providing light?
Answer: | make food | train |
arc_easy | arc_easy | Question: Which lists the diameter of the planets in order from smallest to largest?
Answer: | Mercury, Mars, Venus, Earth | train |
arc_easy | arc_easy | Question: The aloe plant can absorb a lot of water during a rain shower. The extra water is stored in its leaves. The ability to store water in its leaves is most likely an adaptation to which type of environment?
Answer: | one with dry conditions | validation |
arc_easy | arc_easy | Question: When stratospheric ozone levels are reduced, the amount of ultraviolet radiation hitting Earth increases. Ozone depletion is most often caused
Answer: | when fluorocarbons are released into the atmosphere. | validation |
arc_easy | arc_easy | Question: Owen tested a physical property of a mineral. He rubbed a mineral sample on a piece of white tile. The mineral left a red mark on the tile. Which of the following physical properties of the mineral was Owen most likely testing?
Answer: | streak | validation |
arc_easy | arc_easy | Question: Which of these animals has a young form that looks the most like the adult form?
Answer: | human | train |
arc_easy | arc_easy | Question: Two tectonic plates pushing toward each other cause intense heat and pressure in Earth's crust. Into which will crust material be changed by heat and pressure?
Answer: | metamorphic rock | train |
arc_easy | arc_easy | Question: A student states that plants grow taller when grown in natural light than they do in artificial light. Which method is the best way to determine if the statement is fact or opinion?
Answer: | conduct a controlled experiment | train |
arc_easy | arc_easy | Question: Which object is powered by an electrical circuit?
Answer: | a flashlight | train |
arc_easy | arc_easy | Question: Which concept supports the endosymbiotic origin of complex, eukaryotic double-membrane structures?
Answer: | Mitochondria and chloroplasts arise from preexisting mitochondria and chloroplasts. | validation |
arc_easy | arc_easy | Question: Which of these human activities most relies on high-quality soil?
Answer: | Growing crops | train |
arc_easy | arc_easy | Question: What is an example of a shelter in an ecosystem?
Answer: | a raccoon in a hollow log | train |
arc_easy | arc_easy | Question: Some areas of the world are experiencing more desert-like conditions. This change most favors survival of species with the ability to do which of the following?
Answer: | become dormant for long periods | train |
arc_easy | arc_easy | Question: Roger poured water over a pile of sand. Some of the sand washed away. This process is similar to which of the following?
Answer: | The erosion of the walls of a canyon | train |
arc_easy | arc_easy | Question: When an earthquake wave passes from the crust to the mantle, the wave
Answer: | changes speed. | train |
arc_easy | arc_easy | Question: A student wraps a wire around an iron nail. The student then connects the wire to a battery. The nail attracts another nail and they stick together. What force holds the two nails together?
Answer: | magnetic force | train |
arc_easy | arc_easy | Question: Natural processes cause rapid and slow changes to Earth's surface. Which event causes changes to Earth's surface most rapidly?
Answer: | an earthquake shaking the ground | train |
arc_easy | arc_easy | Question: Since 1961, Nevada has led the United States in production of which resource?
Answer: | gold | train |
arc_easy | arc_easy | Question: A class is testing the effect of exercise on heart rate. The heart rate of two students before exercise is compared to their heart rate after running around a track. Which procedure will most likely help the class correctly compare the results of the two students?
Answer: | have the students run for the same amount of time | train |