TExES CORE Subjects EC-6 (391): Science V2 || Zero Flaw on
Answers.
Which of the following body systems is responsible for taking in oxygen and expelling carbon
dioxide?
A. lymphatic system
B. digestive system
C. circulatory system
D. respiratory system correct answers D. respiratory system
Where is the majority of nitrogen on Earth?
A. trees
B. rocks
C. animal waste
D. the atmosphere correct answers D. the atmosphere
Which of the following is a key characteristic of scientific inquiry?
A. Scientific discoveries are more important than ethical decisions.
B. The results of experiments should only be communicated when scientists are sure the outcome
proves a scientific law.
C. Scientific discovery is relative, depending on who carries out the research.
D. Scientific theories are open to change as new information is discovered. correct answers D.
Scientific theories are open to change as new information is discovered.
,Susanne and Xavier are workers on a road construction crew. When lifting a rock, Xavier lifts
the rock straight up, but Susanne uses a lever, as shown.
Neglecting any friction, which worker does the most work lifting the same rock to a height of 2
inches off the ground? Assume the weight of the lever is negligible.
A. Xavier does more work because he uses only his muscles to lift the rock.
B. Xavier does more work because he must pull upward, whereas Susanne can push downward.
C. Susanne does more work because she must move the lever farther.
D. Both do the same amount of work. correct answers D. both do the same amount of work
Pressures driving natural selection include all of the following except:
A. available resources
B. equal populations of all organisms
C. predator-prey relationships
D. climate change correct answers B. equal populations of all organisms
The earth is divided into four distinct layers. Which layer is composed of very hot, liquid
material?
A. crust
B. outer core
C. mantle
D. inner core correct answers B. outer core
Which quality would a scientist be measuring if he were using an anemometer?
A. rainfall
,B. atmospheric pressure
C. humidity
D. wind speed correct answers D. wind speed
A student measures the volume of 12.8 ml of liquid with a graduated cylinder, checking the
measurement three times to obtain volumes of 13.2 ml, 13.2 ml, and 13.1 ml. The student's
measurements are:
A. precise but not accurate.
B. both precise and accurate.
C. accurate but not precise.
D. neither accurate or precise correct answers A. precise but not accurate
Which of the following activities best helps students practice the process skill of observing?
A. making a table to show the relative hardness of minerals
B. using a thermometer to determine the temperature at which water boils
C. using a magnifying glass to inspect the small features on the surface of a leaf
D. sorting rocks by the size of their crystals correct answers C. using a magnifying glass to
inspect the small features on the surface of a leaf
Which of the following is the best example of a behavioral adaptation?
A. A tiger's sharp claws allows it to easily tear open its prey.
B. Brightly colored male birds attract female birds for reproduction.
C. Flounders on the floor of the Gulf coast use colored scales to hide from predators.
D. Grizzly bears in Alaska will hibernate in the winter. correct answers D. Grizzly bears in
Alaska will hibernate in the winter.
, A tug-of-war rope is being pulled with a force of 80 N to the left by Jeff and a force of 50 N to
the right by Rico. What is the net force acting on the rope?
A. 130 N to the left
B. 30 N to the right
C. 30 N to the left
D. 130 N to the right correct answers C. 30 N to the left
Ticks are mites that attach themselves to animals, such as dogs, and suck blood. In doing so,
ticks transmit diseases, such as Lyme disease, to the animals. Which type of interaction does this
describe?
A. mutualism
B. parasitism
C. neutralism
D. commensalism correct answers B. parasitism
Mr. Harris has several English-language learners in his classroom. He is currently beginning a
unit about circuits. Which of the following activities will be most effective in engaging Mr.
Harris' English-language learners in a lesson?
A. using a drawing of a light bulb while explaining why they produce light
B. giving students bulbs, batteries, and connecting wires and asking them to try to make the
bulbs light up
C. listing and defining vocabulary words associated with circuits on the board while students
copy the words and definitions
D. having students read a web page about circuits and why they work correct answers B. giving
students bulbs, batteries, and connecting wires and asking them to try to make the bulbs light up
Answers.
Which of the following body systems is responsible for taking in oxygen and expelling carbon
dioxide?
A. lymphatic system
B. digestive system
C. circulatory system
D. respiratory system correct answers D. respiratory system
Where is the majority of nitrogen on Earth?
A. trees
B. rocks
C. animal waste
D. the atmosphere correct answers D. the atmosphere
Which of the following is a key characteristic of scientific inquiry?
A. Scientific discoveries are more important than ethical decisions.
B. The results of experiments should only be communicated when scientists are sure the outcome
proves a scientific law.
C. Scientific discovery is relative, depending on who carries out the research.
D. Scientific theories are open to change as new information is discovered. correct answers D.
Scientific theories are open to change as new information is discovered.
,Susanne and Xavier are workers on a road construction crew. When lifting a rock, Xavier lifts
the rock straight up, but Susanne uses a lever, as shown.
Neglecting any friction, which worker does the most work lifting the same rock to a height of 2
inches off the ground? Assume the weight of the lever is negligible.
A. Xavier does more work because he uses only his muscles to lift the rock.
B. Xavier does more work because he must pull upward, whereas Susanne can push downward.
C. Susanne does more work because she must move the lever farther.
D. Both do the same amount of work. correct answers D. both do the same amount of work
Pressures driving natural selection include all of the following except:
A. available resources
B. equal populations of all organisms
C. predator-prey relationships
D. climate change correct answers B. equal populations of all organisms
The earth is divided into four distinct layers. Which layer is composed of very hot, liquid
material?
A. crust
B. outer core
C. mantle
D. inner core correct answers B. outer core
Which quality would a scientist be measuring if he were using an anemometer?
A. rainfall
,B. atmospheric pressure
C. humidity
D. wind speed correct answers D. wind speed
A student measures the volume of 12.8 ml of liquid with a graduated cylinder, checking the
measurement three times to obtain volumes of 13.2 ml, 13.2 ml, and 13.1 ml. The student's
measurements are:
A. precise but not accurate.
B. both precise and accurate.
C. accurate but not precise.
D. neither accurate or precise correct answers A. precise but not accurate
Which of the following activities best helps students practice the process skill of observing?
A. making a table to show the relative hardness of minerals
B. using a thermometer to determine the temperature at which water boils
C. using a magnifying glass to inspect the small features on the surface of a leaf
D. sorting rocks by the size of their crystals correct answers C. using a magnifying glass to
inspect the small features on the surface of a leaf
Which of the following is the best example of a behavioral adaptation?
A. A tiger's sharp claws allows it to easily tear open its prey.
B. Brightly colored male birds attract female birds for reproduction.
C. Flounders on the floor of the Gulf coast use colored scales to hide from predators.
D. Grizzly bears in Alaska will hibernate in the winter. correct answers D. Grizzly bears in
Alaska will hibernate in the winter.
, A tug-of-war rope is being pulled with a force of 80 N to the left by Jeff and a force of 50 N to
the right by Rico. What is the net force acting on the rope?
A. 130 N to the left
B. 30 N to the right
C. 30 N to the left
D. 130 N to the right correct answers C. 30 N to the left
Ticks are mites that attach themselves to animals, such as dogs, and suck blood. In doing so,
ticks transmit diseases, such as Lyme disease, to the animals. Which type of interaction does this
describe?
A. mutualism
B. parasitism
C. neutralism
D. commensalism correct answers B. parasitism
Mr. Harris has several English-language learners in his classroom. He is currently beginning a
unit about circuits. Which of the following activities will be most effective in engaging Mr.
Harris' English-language learners in a lesson?
A. using a drawing of a light bulb while explaining why they produce light
B. giving students bulbs, batteries, and connecting wires and asking them to try to make the
bulbs light up
C. listing and defining vocabulary words associated with circuits on the board while students
copy the words and definitions
D. having students read a web page about circuits and why they work correct answers B. giving
students bulbs, batteries, and connecting wires and asking them to try to make the bulbs light up
