Ecosystems
Which type of animal usually eats both producers and consumers?
A) an omnivore
B) a carnivore
C) a herbivore
D) a predator
A) an omnivore
Which is a characteristic of most single-celled organisms?
A) They have a complex nervous system.
B) They contain several different types of cells.
C) They perform all life processes.
D) They have a circulatory and a respiratory system.
C) They perform all life processes.
A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon?
A)It would cause the wagon to move faster.
B) It would cause the wagon to change mass.
C) It would cause the wagon to change direction.
D) It would cause the wagon to slow down
D) It would cause the wagon to slow down
Which is most responsible for the changes in seasons?
A) the jet stream
B) the ocean currents
C) the distance from Earth to the sun
D) the tilt of Earth on its axis
D) the tilt of Earth on its axis
When the sun warms water, which resulting process occurs?
A) precipitation
B) runoff
C) evaporation
D) condensation
C) evaporation
Which has the greatest effect on the amount of salt in a salt marsh?
A) the number of animals living in the marsh
B) the closeness of the marsh to the ocean
C) the depth of the water in the marsh
D) the temperature of the water in the marsh
B) the closeness of the marsh to the ocean
Which statement best describes how a multicellular organism survives?
A) Every cell carries out the same functions for the survival of the organism.
B) The cells all have the same structures that allow the organism to survive.
C) All life processes are performed by each cell for the survival of the organism.
D) The cells have different functions, and together they are essential for the survival of the organism.
D) The cells have different functions, and together they are essential for the survival of the organism.
A runner measured the time it took him to run 5 km. What can he calculate from the distance and time measurements?
A) direction
B) mass
C) speed
D) force
C) speed
In North Carolina, the wind is blowing from the north. If the wind changes direction and begins to blow from the south, what will most likely result?
A) The temperatures will increase.
B) The temperatures will decrease.
C) The air pressure will increase.
D) The wind speeds will decrease.
A) The temperatures will increase.
Students observed a piece of iron change from shiny to rusty. What caused this change?
A) a chemical reaction
B) a heat reaction
C) a cold reaction
D) a physical reaction
A) a chemical reaction
Which classification best describes herbivores?
A) producers
B) consumers
C) predators
D) decomposers
B) consumers
What is the relationship between the respiratory system and the circulatory system?
A) The respiratory system exchanges oxygen and carbon dioxide with the circulatory system.
B) The respiratory system exchanges oxygen and carbon monoxide with the circulatory system.
C) The respiratory system exchanges oxygen and sugar with the circulatory system.
D) The respiratory system exchanges oxygen and nitrogen with the circulatory system.
A) The respiratory system exchanges oxygen and carbon dioxide with the circulatory system.
Which best explains why a bicycle slows down when its brakes are applied?
A) The brakes heat the rubber on the bicycle tires.
B) The brakes add energy to the bicycle.
C) The brakes increase the force of gravity on the bicycle.
D) The brakes cause frictional forces on the wheels of the bicycle.
D) The brakes cause frictional forces on the wheels of the bicycle.
Which best explains why a storm that affects an area in the western United States may affect an area in the eastern United States a few days later?
A) The jet stream winds blow storms from east to west.
B) The jet stream winds blow storms from west to east.
C) Cool Gulf Stream water causes storms to form in the east.
D) Warm Gulf Stream water causes storms to form in the west.
B) The jet stream winds blow storms from west to east.
Which is the best example of the transfer of heat by radiation?
A) water boiling
B) ice melting
C) a hot air balloon rising
D) a lightbulb glowing
D) a lightbulb glowing
What will be most affected if the decomposers in an ecosystem are removed?
A) the spread of disease
B) the availability of water
C) the quality of soil
D) the distribution of organisms
C) the quality of soil
In what way are the digestive and circulatory systems alike?
A) Both protect organs in the body.
B) Both control movement of the body.
C) Both absorb gases or nutrients into the body.
D) Both provide structural support for the body.
C) Both absorb gases or nutrients into the body.
A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop?
A) air
B) gravity
C) mass
D) friction
D) friction
Which best describes the cause of day-to-day weather changes?
A) the rotation of Earth
B) the size of Earth
C) moving air masses
D) action of the winds
C) moving air masses
Jason fills a glass container completely with water and screws the lid on tightly. He places the container in a freezer. Which will most likely result?
A) The container will prevent the water from freezing.
B) The water will freeze and take up less space in the container.
C) The water in the container will expand when it freezes and cause the container to crack.
D) The container will absorb heat from the water, causing it to crack.
C) The water in the container will expand when it freezes and cause the container to crack.
grass → grasshopper → bird How is the grass in this food chain best described?
A) It is a producer, because it makes its own food.
B) It is a producer, because it is eaten by consumers.
C) It is a consumer, because it gets energy from producers.
D) It is a decomposer, because it breaks down sunlight
A) It is a producer, because it makes its own food.
A mother rabbit has a litter. One of the babies is born with one long ear and one short ear. What most likely caused this one rabbit to be born with one short ear?
A) The mother rabbit had previously lost an ear in an accident.
B) The mother rabbit became sick before she gave birth.
C) A mutation occurred during the development of this one rabbit.
D) This one rabbit received less nutrition than the other rabbits before it was born.
C) A mutation occurred during the development of this one rabbit.
If a car is moving backward along a road, can its speed be measured?
A) Yes, it can, because the car does not have friction acting on it.
B) Yes, it can, because the car travels a distance in a certain amount of time.
C) No, it cannot, because speed can only be measured if the car is moving forward.
D) No, it cannot, because the distance traveled backward by a car cannot be measured.
B) Yes, it can, because the car travels a distance in a certain amount of time.
Students report that the sky in their area has mostly cirrus clouds. What are most likely the weather conditions in the area?
A) rainy
B) cold
C) windy
D) fair
D) fair
One morning, a student notices that the grass in the area is wet, although it had not rained during the night. What could have caused the grass to be wet?
A) During the night, water had evaporated from the trees in the area.
B) The air above the ground became warmer during the night and caused precipitation.
C) When the air cooled above ground during the night, water vapor condensed on the grass.
D) The grass soaked up water from the ground during the night.
C) When the air cooled above ground during the night, water vapor condensed on the grass.
Which would most likely cause a decrease in a population of herbivores?
A) an increase in the number of producers
B) a decrease in the types of decomposers
C) an increase in the types of plants
D) an increase in the number of carnivores
D) an increase in the number of carnivores
Which is an example of a trait that is inherited?
A) dimples
B) intelligence
C) weight
D) favorite color
A) dimples
Scientists discover an asteroid that is moving through space. What information is needed to determine the average speed of the asteroid?
A) the mass and size of the asteroid
B) the distance the asteroid is from Earth
C) the direction the asteroid is moving and its distance from Earth
D) how far the asteroid has moved in 24 hours
D) how far the asteroid has moved in 24 hours
Which best describes a hurricane?
A) a low-pressure weather system
B) a high-pressure weather system
C) a cold front
D) a stationary front
A) a low-pressure weather system
Two liquids are poured together, and a solid substance forms with no liquid remaining. Liquid 1 has a mass of 200 grams, and liquid 2 has a mass of 100 grams. What would be the total mass of the solid substance formed?
A) 100 grams
B) 150 grams
C) 250 grams
D) 300 grams
D) 300 grams
A mouse eats seeds and insects. Which best describes the role of the mouse?
A) consumer
B) decomposer
C) herbivore
D) producer
A) consumer
In what way are the circulatory system and the nervous system similar?
A) They both perform the same function.
B) They are both structural systems.
C) They are both transport systems.
D) They both involve the same organs.
C) They are both transport systems.
What causes a wagon to speed up when going down a hill?
A) gravity
B) friction
C) air pressure
D) mass
A) gravity
Which instrument is best used to predict weather changes?
A) a hygrometer
B) an anemometer
C) a thermometer
D) a barometer
D) a barometer
Which is the best example of a new substance forming?
A) lighting a match
B) cutting a piece of paper
C) popping a balloon
D) hitting a nail with a hammer
A) lighting a match
What would most likely result if all plants in an area were destroyed?
A) Consumer populations would increase because more sunlight would reach the ground.
B) Decomposer populations would increase because more sunlight would reach the ground.
C) Consumer populations would decrease because plants provide them with water.
D) Consumer populations would decrease because plants provide them with energy.
D) Consumer populations would decrease because plants provide them with energy.
Which system in the human body includes the heart, blood, arteries, and veins?
A) cardiovascular
B) digestive
C) muscular
D) respiratory
A) cardiovascular
A bowling ball moves across a flat surface at 7 feet per second. If a student is asked to calculate the total distance traveled by the ball, what other information does the student need to know?
A) amount of friction between the ball and the surface
B) amount of force applied to the ball
C) total time the ball rolled
D) mass of the ball
C) total time the ball rolled
On a June day, a warm, moist air mass slowly passes over a colder air mass in North Carolina. What will most likely happen next?
A) Rain will fall.
B) Cirrus clouds will form.
C) Skies will clear.
D) Atmospheric pressure will rise.
A) Rain will fall.
Stirring a cup of hot tea causes a metal spoon to get warm. Which statement best explains why the spoon gets warm?
A) Heat energy transfers from the metal spoon to the hot liquid.
B) Heat energy transfers from the hot tea to the spoon.
C) Heat energy transfers from the air to the hot liquid, and then to the spoon.
D) Heat energy transfers from the hot liquid to the cup, and then to the spoon.
B) Heat energy transfers from the hot tea to the spoon.
What would most likely happen if all of the decomposers in an ecosystem were removed?
A) The animals in the ecosystem would die because of the spread of disease.
B) The plants in the ecosystem would eventually die because of a lack of nutrients in the soil.
C) The plants in the ecosystem would begin to die out because of a decrease in available water.
D) The animals in the ecosystem would eat other types of food because of a decrease in producers.
B) The plants in the ecosystem would eventually die because of a lack of nutrients in the soil.
Which of these traits is most influenced by a person’s environment?
A) ability to roll the tongue
B) blood type
C) weight
D) eye color
C) weight
(Human Body) Which characteristic is the best example of an inherited trait?
A) short hair
B) eye color
C) pierced ears
D) long fingernails
B) eye color
Which is most responsible for the movement of weather systems across the United States?
A) the Gulf Stream
B) the prevailing westerlies
C) the southeast trade winds
D) the jet stream
D) the jet stream
Which material is best used to keep cold drinks from getting warm too quickly?
A) glass, because it is a good conductor of heat
B) foam, because it is a poor conductor of heat
C) metal, because it radiates heat
D) paper, because it conducts heat
B) foam, because it is a poor conductor of heat
A food chain in an ecosystem includes blackberry bushes, deer, and wolves (deer eat blackberries and wolves eat deer). If the population of wolves decreases, how will this affect the population of blackberry bushes?
A) It will decrease because there will be fewer deer.
B) It will increase because there will be fewer deer.
C) It will decrease because there will be more deer.
D) It will increase because there will be more deer.
C) It will decrease because there will be more deer.
Which is most likely the reason parents and their children have similar physical traits?
A) They live in the same home.
B) They have similar genetic structures.
C) They are born in similar environments.
D) They have similar blood types.
B) They have similar genetic structures.
(Human Body) Which is an example of a noninherited trait?
A) shape of face
B) hair color
C) food preference
D) tongue rolling
C) food preference
Which best describes how the Gulf Stream affects the areas along the coast of North Carolina?
A) It causes winds to move from north to south during the winter.
B) It causes winds to move from north to south during the summer.
C) It causes land temperatures along the coast to be colder in the winter.
D) It causes land temperatures along the coast to be milder in the winter.
D) It causes land temperatures along the coast to be milder in the winter.
How does the energy from the sun influence the water cycle?
A) by trapping water particles in clouds
B) by turning liquid water into water vapor
C) by causing water to precipitate
D) by creating winds in the atmosphere
B) by turning liquid water into water vapor