question stringlengths 14 1.87k | choices listlengths 2 9 | answer stringclasses 4
values | source stringclasses 3
values | __index_level_0__ int64 0 17k |
|---|---|---|---|---|
In the human body, what part of the central nervous system connects with other nerves outside of the central nervous system? | [
"dendrite",
"cerebrum",
"cerebellum",
"spinal cord"
] | D | ai2_arc | 600 |
Photovoltaic cells capture photons of sunlight and transform them directly into electricity. Many of Earth's other energy resources are simply transformed solar energy. Which two energy resources store energy that did not begin as solar energy? | [
"oil and coal",
"wind and wood",
"nuclear and geothermal",
"hydropower and natural gas"
] | C | ai2_arc | 601 |
What determines how long the Moon takes to complete one cycle of phases? | [
"the period of rotation of the Moon around its axis",
"the period of revolution of the Moon around Earth",
"the period of rotation of Earth around its axis",
"the period of revolution of Earth around the Sun"
] | B | ai2_arc | 602 |
Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions? | [
"A different mixture is formed in each case.",
"A different solution is formed in each case.",
"Both a change of state and of elements is involved.",
"New molecules are formed but the same elements exist."
] | D | ai2_arc | 603 |
What is the primary job of red blood cells? | [
"transport oxygen",
"remove waste",
"fight disease",
"allow reproduction"
] | A | ai2_arc | 604 |
What kingdom contains organisms that are multicellular, have no chlorophyll, and absorb nutrients from decaying tissue? | [
"Fungi",
"Plantae",
"Protista",
"Animalia"
] | A | ai2_arc | 605 |
A salvage yard contains a mixture of iron, glass, aluminum, and plastic. Which property of iron does the salvage yard take advantage of when separating the iron from the rest of the materials? | [
"magnetic",
"electrical",
"ductility",
"malleability"
] | A | ai2_arc | 606 |
While a sailor was out fishing, he got lost at sea. Which object would help him direct the boat back to shore? | [
"Rope",
"Magnetic compass",
"Blanket",
"Measuring tape"
] | B | ai2_arc | 607 |
Water is a very important part of the physical weathering of rock. Which of these properties of water is most important in causing some of the physical weathering of rock? | [
"Water is a liquid at room temperature.",
"Water can contain different minerals.",
"Water expands when it freezes.",
"Water dissolves many chemicals."
] | C | ai2_arc | 608 |
A student uses a telescope to view stars at night. The student notices some of the stars are different colors. The color of a star is determined most by its | [
"size.",
"distance from Earth.",
"mass.",
"temperature."
] | D | ai2_arc | 609 |
Which function is performed at similarly structured sites in prokaryotic and eukaryotic cells? | [
"protein synthesis",
"packaging and transport of proteins",
"storage of genetic material",
"release of energy from storage forms"
] | A | ai2_arc | 610 |
Which material is the best natural resource to use for making water-resistant shoes? | [
"cotton",
"leather",
"plastic",
"wool"
] | B | ai2_arc | 611 |
When hunting by humans causes a species to become extinct, this may produce damaging effects throughout the ecosystem of the extinct species. What is the cause of this damage? | [
"alteration of a food web",
"degradation of a habitat",
"modification of a climate",
"reversal of a flow of energy"
] | A | ai2_arc | 612 |
Sarah's class is learning about mixtures and solutions. Her teacher writes four statements on the board. Which statement best describes a mixture? | [
"Both substances mix evenly.",
"Both substances can evaporate.",
"One substance dissolves into another.",
"One substance can be separated from the other."
] | D | ai2_arc | 613 |
Which of the following best explains why the Sun appears to move across the sky every day? | [
"The Sun rotates on its axis.",
"Earth rotates on its axis.",
"The Sun orbits around Earth.",
"Earth orbits around the Sun."
] | B | ai2_arc | 614 |
The theory of spontaneous generation was eventually disproved scientifically by | [
"arguments in philosophy.",
"chemical analysis of material.",
"examining models of the process.",
"conducting a controlled experiment."
] | D | ai2_arc | 615 |
Discarded electronic devices, such as outdated computers and cell phones, contain materials that can be toxic to the environment. Which statement best explains why humans continue to use these technologies? | [
"Electronics have become less expensive over time.",
"Some areas have recycling programs for electronics.",
"Industries that produce electronics help the economy.",
"Humans value the benefits of these devices over their cost."
] | D | ai2_arc | 616 |
A student crumples up a sheet of paper. Which property of the paper has changed? | [
"color",
"mass",
"state",
"shape"
] | D | ai2_arc | 617 |
When a plant dies, it often decomposes and becomes part of the soil. This process is one step in which cycle? | [
"lunar",
"water",
"carbon",
"energy"
] | C | ai2_arc | 618 |
Which would best aid a scientist in discovering how Earth may have changed over time? | [
"finding the nest of a bald eagle",
"tracking the footprints of a wolf",
"analyzing the pollination of a sunflower",
"discovering a fossil of a seashell in a wooded area"
] | D | ai2_arc | 619 |
Kendall studied the ways in which human body systems work together. He compared the respiratory and circulatory systems. In which way are these two systems similar to each other? | [
"They both bring oxygen to the body.",
"They both send messages to the body.",
"They both digest nutrients for the body.",
"They both pump blood through the body."
] | A | ai2_arc | 620 |
A difference between the oceanic crust and the continental crust is that the oceanic crust is | [
"composed chiefly of sedimentary rocks.",
"more dense than the continental crust.",
"older than the continental crust.",
"continually being created."
] | B | ai2_arc | 621 |
Which of these elements is found in the greatest amount in organisms? | [
"carbon",
"iron",
"lead",
"neon"
] | A | ai2_arc | 622 |
After mining removes layers of rock from a hillside, new plants begin to grow in the cracks of the bare rock. The plants beginning to grow are an example of which natural process? | [
"secondary succession in an existing ecosystem",
"new species developing in an ecosystem",
"species competition in a community",
"primary succession in a new habitat"
] | D | ai2_arc | 623 |
Improvements in farming technology would most likely | [
"increase the amount of food produced.",
"change global climate conditions.",
"promote unhealthy dietary choices.",
"decrease the amount of daily exercise."
] | A | ai2_arc | 624 |
In a container, a mixture of water and salt is stirred so that the salt dissolves completely. Sand is added to this solution and allowed to settle to the bottom of the container. If the container is placed on a heat source and the liquid evaporates completely, what will be left in the container? | [
"Nothing will remain in the container.",
"Only salt will remain in the container.",
"Only sand will remain in the container.",
"Salt and sand will both remain in the container."
] | D | ai2_arc | 625 |
Which of the following is formed immediately after fertilization? | [
"egg",
"sperm",
"zygote",
"embryo"
] | C | ai2_arc | 626 |
Which of the following helped lead to the invention of personal computers? | [
"Internet",
"keyboard",
"wireless transmitter",
"integrated circuit"
] | D | ai2_arc | 627 |
Blood absorbs oxygen in the | [
"heart.",
"lungs.",
"stomach.",
"muscles."
] | B | ai2_arc | 628 |
A student adds sugar, spices, and salt to a bowl of peanuts and stirs them together. What has the student made? | [
"a compound",
"a substance",
"a mixture",
"a solution"
] | C | ai2_arc | 629 |
Over time, non-volcanic mountains can form due to the interaction of plate boundaries. Which interaction is most likely associated with the formation of non-volcanic mountains? | [
"oceanic plates colliding with oceanic plates",
"oceanic plates separating from oceanic plates",
"continental plates colliding with continental plates",
"continental plates separating from continental plates"
] | C | ai2_arc | 630 |
Most stars in the Milky Way are like the Sun. The Sun will eventually become a red giant. After the red giant stage, what determines whether a star will become a white dwarf or a supernova? | [
"the mass of the star",
"the diameter of the star",
"the brightness of the star",
"the type of gas in the star"
] | A | ai2_arc | 631 |
How should researchers share their findings with other scientists to validate their study of the effectiveness of a new medication? | [
"e-mail the research results to local newspapers",
"publish the research results in a scientific journal",
"publish the results in brochures for doctors",
"discuss the research results on the Internet"
] | B | ai2_arc | 632 |
Gaseous sulfur dioxide is a compound that combines with water in the atmosphere to form acid rain. What is the primary source of sulfur dioxide? | [
"volcanic emissions",
"combustion of fossil fuels",
"destruction of tropical forests",
"mining and mineral extraction"
] | B | ai2_arc | 633 |
The motion of Earth is responsible for several celestial events. Which of the following events is caused by Earth revolving around the sun? | [
"the days in a year",
"the hours in a day",
"the changes in the atmosphere of Earth",
"the position of the constellations in space"
] | A | ai2_arc | 634 |
What takes place as a light wave enters a denser medium? | [
"it is reflected",
"it is absorbed",
"it is refracted",
"it is compressed"
] | C | ai2_arc | 635 |
Deforestation in the rainforest can lead to localized extinctions of populations of some organisms. Once an area is deforested, which is most likely to decrease and result in organisms' extinctions? | [
"the amount of annual rainfall",
"competition between consumers",
"the energy available to producers",
"diversity of the resources in the habitat"
] | D | ai2_arc | 636 |
Which of the following causes a ship’s iron anchor to sink to the ocean floor when it is released overboard? | [
"chemical forces",
"gravity",
"magnetism",
"nuclear forces"
] | B | ai2_arc | 637 |
In clear weather, a bright light can be seen for a long distance. In conditions of heavy fog, the visibility is greatly reduced. Which of the following explains the reduced visibility? | [
"Light is refracted by water vapor in the air.",
"Light is scattered by water droplets in the air.",
"Light is absorbed by water vapor near the ground.",
"Light is reflected by water droplets on the ground."
] | B | ai2_arc | 638 |
When the pesticide DDT was first used, it killed nearly every mosquito it touched. Within a few years, however, many mosquitoes became resistant to DDT and survived. What enabled this to happen? | [
"meiosis",
"migration",
"immune responses",
"gene mutations"
] | D | ai2_arc | 639 |
When air is heated, it will most likely | [
"expand and fall.",
"expand and rise.",
"condense and fall.",
"condense and rise."
] | B | ai2_arc | 640 |
A student learns that one year on Mercury is about 88 Earth days. This means it takes 88 Earth days for Mercury to | [
"travel in orbit around its moon.",
"complete one rotation on its axis.",
"switch orbits with the nearest planet.",
"make one complete orbit around the Sun."
] | D | ai2_arc | 641 |
Two processes are involved in the formation of a sand dune. Which two processes best describe how a sand dune forms? | [
"wind erosion then deposition",
"plate movement then deposition",
"wind erosion then water erosion",
"water erosion then plate movement"
] | A | ai2_arc | 642 |
When a student uses the equation, mass multiplied by change in temperature multiplied by specific heat, what is being calculated? q = m \times C \times \Delta T | [
"a phase change",
"stored energy",
"heat convection",
"heat gain or heat loss"
] | D | ai2_arc | 643 |
Which rock is most likely to contain fossil seashells? | [
"basalt",
"gneiss",
"granite",
"limestone"
] | D | ai2_arc | 644 |
Which occurs as a result of Earth's tilt on its rotating axis? | [
"movement of the tides",
"prevalent or trade winds",
"seasonal changes in the climate",
"light and dark changes of day and night"
] | C | ai2_arc | 645 |
Planets remain in orbit around the Sun because of | [
"gravity.",
"friction.",
"solar energy.",
"centrifugal force."
] | A | ai2_arc | 646 |
Which cells help to destroy pathogens such as bacteria that enter the human body? | [
"red blood cells",
"liver cells",
"white blood cells",
"brain cells"
] | C | ai2_arc | 647 |
Eye color in human beings is an | [
"instinct.",
"acquired trait.",
"inherited trait.",
"environmentally influenced trait."
] | C | ai2_arc | 648 |
Which of these is hottest? | [
"The Earth",
"Mars",
"The Moon",
"The Sun"
] | D | ai2_arc | 649 |
In large industrial cities, the emissions from fossil fuels cause the atmosphere to change. Which process allows the atmosphere to change? | [
"increased inorganic matter in soil",
"increased use of fertilizers on crops",
"increased buildup of greenhouse gases",
"increased rainfall rates near power plants"
] | C | ai2_arc | 650 |
Which is the most likely response of a human to an increase in temperature? | [
"increasing the amount of perspiration",
"increasing waste elimination from the bladder",
"a reduction in the desire for liquids",
"a contraction in blood vessels in the skin"
] | A | ai2_arc | 651 |
An organism's traits are largely determined by the genetic makeup of its parents. A mutation in which kinds of cells in a parent could cause a new trait to appear in the parent's offspring? | [
"sperm or egg",
"egg or nerve",
"nerve or muscle",
"muscle or sperm"
] | A | ai2_arc | 652 |
Electricity to play your radio can be made using renewable or nonrenewable resources. Which of the following resources are renewable? | [
"wind and oil",
"wind and sunlight",
"natural gas and oil",
"natural gas and coal"
] | B | ai2_arc | 653 |
The action of turning off the water while brushing teeth is an example of | [
"recycling.",
"adaptation.",
"conservation.",
"resourcefulness."
] | C | ai2_arc | 654 |
Which objects are the most useful for collecting data on the speed of a toy car? | [
"microscope, computer, ruler",
"thermometer, calculator, magnet",
"stopwatch, calculator, meter stick",
"camera, digital recorder, safety goggles"
] | C | ai2_arc | 655 |
Which of these objects is visible because it reflects light toward the eye? | [
"burning candle",
"flashlight bulb",
"glowing campfire log",
"shiny metallic balloon"
] | D | ai2_arc | 656 |
Which dog trait is a learned behavior? | [
"blinking its eyes",
"scratching an itch",
"panting to cool off",
"jumping to catch a ball"
] | D | ai2_arc | 657 |
When an atom has a neutral charge, which particles within the atom have equal numbers? | [
"electrons and neutrons",
"protons and electrons",
"neutrons and protons",
"ions and neutrons"
] | B | ai2_arc | 658 |
A paper bag is ripped into pieces. Which of these BEST describes the pieces of the bag? | [
"Stronger than the whole bag",
"Thicker than the whole bag",
"Smaller than the whole bag",
"Darker than the whole bag"
] | C | ai2_arc | 659 |
A lizard most likely would be protected from its enemies if it has which characteristic? | [
"claws to catch prey",
"a long tail to climb trees",
"eyes that can see far distances",
"skin color that matches its habitat"
] | D | ai2_arc | 660 |
Copper is used in house wiring because it is | [
"magnetic.",
"an insulator.",
"an electrical conductor.",
"hard to bend into new shapes."
] | C | ai2_arc | 661 |
Which process causes light to bend and form a rainbow? | [
"frequency",
"resonance",
"refraction",
"reflection"
] | C | ai2_arc | 662 |
Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following? | [
"an atom",
"a compound",
"an electron",
"a mixture"
] | B | ai2_arc | 663 |
The tendency of a stationary object to resist being put into motion is known as | [
"acceleration.",
"inertia.",
"weight.",
"velocity."
] | B | ai2_arc | 664 |
One way that students can help conserve natural resources at school is by | [
"recycling aluminum cans.",
"emptying waste baskets.",
"wearing warmer clothes.",
"eating all of their lunch."
] | A | ai2_arc | 665 |
The Grand Canyon is an example of | [
"erosion.",
"deposition.",
"an earthquake.",
"volcanic activity."
] | A | ai2_arc | 666 |
Humans cannot survive without clean, fresh water. Reservoirs of liquid water vary, but all water spends time as a gas in the atmosphere. What is the source of most of the water in the atmosphere? | [
"lakes",
"oceans",
"rivers",
"glaciers"
] | B | ai2_arc | 667 |
When a frying pan is placed on an electric stove top, heat energy is transferred from the burner to the pan by | [
"convection.",
"radiation.",
"conduction.",
"insulation."
] | C | ai2_arc | 668 |
What happens when water flows over a rock for a long period of time? | [
"erosion",
"flooding",
"breakage",
"evaporation"
] | A | ai2_arc | 669 |
During winter, the white fur of an arctic fox blends in with the snow. This adaptation is called | [
"hibernation",
"migration",
"camouflage",
"movement"
] | C | ai2_arc | 670 |
How has the invention of the personal computer helped people the most? | [
"by replacing paper",
"by reducing pollution",
"by improving transportation",
"by increasing communication"
] | D | ai2_arc | 671 |
Humans depend on which natural resource from the environment? | [
"water",
"houses",
"electricity",
"roads"
] | A | ai2_arc | 672 |
The danger posed to fish in an aquarium by an overpopulation of bacteria caused by an algal bloom is most likely a | [
"decrease in water temperature.",
"reduction in oxygen levels.",
"decrease in food supply.",
"removal of minerals."
] | B | ai2_arc | 673 |
Natural processes shape the surface of Earth. Most canyons are formed by ___. | [
"ice",
"plants",
"steady winds",
"moving water"
] | D | ai2_arc | 674 |
What is the best way for a student to describe the results of an experiment? | [
"in a diagram",
"in an oral report",
"in a written report",
"in a photo essay"
] | C | ai2_arc | 675 |
Which of the following is a living component of a desert in California? | [
"low rainfall",
"hot temperature",
"polar bear",
"horned lizard"
] | D | ai2_arc | 676 |
Scientists wonder how the Egyptian pyramids were built. They think that the huge blocks of stone may have been put into place by pushing them up a sloping pathway. The pathway is which type of simple machine? | [
"lever",
"pulley",
"inclined plane",
"wheel and axle"
] | C | ai2_arc | 677 |
Magnesium strips are long, thin strips that are gray and shiny. Which action will lead to a chemical change of magnesium strips? | [
"putting them in the freezer",
"burning them with a candle",
"cutting them into small pieces",
"mixing them with pieces of copper"
] | B | ai2_arc | 678 |
Which involves the greatest variety of cell types? | [
"a tissue",
"an organ",
"an organ system",
"an organism"
] | D | ai2_arc | 679 |
Snapping a rubber band most likely produces which type of energy? | [
"heat",
"light",
"sound",
"electrical"
] | C | ai2_arc | 680 |
People can help keep a forest a good place for birds to live by | [
"dumping garbage in a small part of the forest",
"building a road through the middle of the forest",
"burning dead trees to make smoke in the air",
"preventing too many trees from being cut down"
] | D | ai2_arc | 681 |
Randall is picking lettuce from his garden for dinner. His mother told him to leave some leaves on each plant. Why is it important to leave some leaves on the plant? | [
"Leaves help the plant make food.",
"Leaves help the plant absorb water.",
"Leaves help the plant stand upright.",
"Leaves help the plant make seeds."
] | A | ai2_arc | 682 |
A negatively-charged ion has | [
"a heavier nucleus.",
"a greater atomic mass.",
"more electrons than protons.",
"more electrons than neutrons."
] | C | ai2_arc | 683 |
Which statement explains what will most likely happen to the hydrosphere in an area where air temperatures increase? | [
"Earthquake intensity will decrease.",
"Mountain formation will decrease.",
"Rock weathering will increase.",
"Evaporation will increase."
] | D | ai2_arc | 684 |
When buried sediments are subjected to pressure, the mineral grains are squeezed together. What is the result of this action? | [
"volcanoes",
"earthquakes",
"new rock is formed",
"layers rise to the surface"
] | C | ai2_arc | 685 |
What is the primary source of energy for organisms from a beach ecosystem? | [
"sand",
"oxygen",
"the Sun",
"the ocean"
] | C | ai2_arc | 686 |
Before rock can become soil, it must undergo certain processes. One process in the formation of soil involves plants. How can plants chemically change rocks into soil? | [
"They weather rocks with acid.",
"They strip the rocks of minerals.",
"They break rocks into small pieces.",
"They increase the density of the rocks."
] | A | ai2_arc | 687 |
Which is the best way a science student can help to maintain laboratory equipment? | [
"perform investigations using only new materials",
"throw away glass items after investigations are complete",
"clean up all materials and workspaces after investigations",
"eat in the laboratory only after investigations are complete"
] | C | ai2_arc | 688 |
Which of the following statements best explains why stars appear to move across Earth's sky each night? | [
"Earth rotates on its axis.",
"The stars orbit each other.",
"Earth revolves around the Sun.",
"The stars rotate with the Moon."
] | A | ai2_arc | 689 |
Researchers are developing new types of crop plants with desirable characteristics such as disease resistance and drought tolerance. Crossing plants so that the next generation will express desirable traits is best described as | [
"selective breeding.",
"natural selection.",
"genetic engineering.",
"gene sequencing."
] | A | ai2_arc | 690 |
In May 2007, wildfires burned more than 350 square miles of habitat in Florida and Georgia. Intense fires like this one can temporarily remove nitrogen, phosphorus, and potassium in area soil. What most likely happens in the burned areas until organic decay replenishes the lost nutrients? | [
"Consumers take on the ecological role of producers.",
"Only secondary consumers obtain the resources they need.",
"The carrying capacity of the soil for plant growth is reduced.",
"The remaining organisms in the area become more territorial."
] | C | ai2_arc | 691 |
Helen is preparing a presentation about objects in the solar system. She includes facts about the order of the planets and their distances from the Sun. Which statement could she include in an accurate presentation? | [
"Mars is closer to the Sun than Earth.",
"Neptune is one light-year from the Sun.",
"Jupiter is farther from the Sun than Uranus.",
"Earth is one astronomical unit from the Sun."
] | D | ai2_arc | 692 |
Farmers in the 1800s used axes to clear trees from farmland. Now, farmers use chainsaws to clear the trees. How do chainsaws most likely help farmers? | [
"Farmers can cut different types of trees.",
"Farmers can remove more trees in less time.",
"Farmers can replant more trees in the fields.",
"Farmers can produce more products from the trees."
] | B | ai2_arc | 693 |
What can a moving magnet in a coil of copper wire cause? | [
"an electric current",
"friction on wheels",
"an increase in gravity",
"a decrease in heat"
] | A | ai2_arc | 694 |
A researcher determines a cell has a flexible cell wall composed of peptidoglycan. This observation narrows possible classifications of the cell to which taxonomic group? | [
"archaea",
"bacteria",
"fungi",
"plants"
] | B | ai2_arc | 695 |
A student conducts an investigation using mold spores. In one part of the investigation, he needs to closely examine a spore sample. Which piece of equipment does the student need to use to keep mold spores from entering his respiratory system? | [
"breathing mask",
"safety goggles",
"rubber gloves",
"lead smock"
] | A | ai2_arc | 696 |
Vultures are scavengers that most likely help ecosystems by quickly consuming dead organisms and | [
"speeding up the process of decay.",
"taking nonliving matter from the environment.",
"slowing the spread of disease.",
"helping to distribute seeds."
] | C | ai2_arc | 697 |
What is the process called when an acid and a base combine to produce water and salt? | [
"neutralization",
"dilution",
"titration",
"physical reaction"
] | A | ai2_arc | 698 |
Amylase is a chemical that decomposes starch into maltose and dextrin. Which best describes the role of amylase in the human body? | [
"as an inhibitor of insulin production",
"as an enzyme that aids in digestion",
"as a catalyst for protein synthesis",
"as a receptor of fatty acid chains"
] | B | ai2_arc | 699 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.