Nature of Science
Review
Record each answer on the wipe-off board and wait for the teacherto say “and the answer is” to holdup the board and show her theanswer
1.During a laboratory experiment, A student listenscarefully as the teacher gives instructions for the use,cleaning, and storage of glassware in the laboratory. Allof the following activities are safe laboratory practicesfor a student except...
A. washing, rinsing, and drying glassware beforeleaving the laboratory.
B. storing clean glassware as directed by the teacher.
C. using glassware only as directed by the teacher.
D. using glassware that is chipped or cracked.
and the answer is……
D. using glassware thatis chipped or cracked.
2. A student sets up an investigation withtwo identical plants. He uses containersand soil that are the same.
On day 1, he adds fertilizer to plant B.
Each plant gets 10 mL of water every day.
The student provides the pictures of theplants that he took on day 1 and day 10.
What is the problem question for thisexperiment?
A Does water affect plant growth?
B Does fertilizer affect plant growth?
C Do soil types affect plant growth?
D Do different types of plants grow atdifferent rates?
and the answer is……
B . Does fertilizer affect plant growth?
3. Which statement is aconclusion that can be madefrom the data plotted on thegraph?
A. The number of organismscontinues to increase as thetemperature is raised.
B. Most organisms arepresent when thetemperature is at its lowest.
C. There is a suitabletemperature for the growthof these organisms.
D. The highest temperaturefavors the maximum growthof these organisms.
and the answer is……
C. There is a suitabletemperature for the growth ofthese organisms.
A student set up an experiment to find out if the adding salt to ice waterchanges the temperature of the water. Read the steps in her experiment.
1. Label 3 plastic cups. Cup A: no salt. Cup B: 3 tablespoons salt; CupC: ½ cup salt.
2. Fill each cup with ice cubes.
3. Add water to fill each cup.
4. Take the temperature of the water in each cup at 0 minutes.
5. Take the temperature of the water in each cup after 15 minutes
6. Take the temperature of the water in each cup after 30 minutes.
4. What is the independent variable in this experiment?
A. The temperature of the water at the start
B. The number of ice cubes in each cup
C. The temperature of the water after 15 minutes
D. The amount of salt in the water
and the answer is……
D. The amount of salt in the water
5. In an experiment investigating how far modelairplanes with different shapes can travel, which ofthe following are variables that need to becontrolled?
A. type of wood used; mass of the planes; amountof glue used; amount of air currents and breezes
B. whether the shapes look like real airplanes;how old the models are
C. the time it takes for each test
D. whether the models land smoothly or becomedamaged during the test
and the answer is……
A.type of wood used; mass of the planes;
amount of glue used; amount of
air currents and breezes
6. Which of the following is a not aquantitative observation?
A. The classroom walls are yellow.
B. There are 21 students in the room.
C. The chalkboard is 1 meter high and 2meters wide.
D. Sixteen students were present forroll call, and five other students arrivedafterward
and the answer is……
A. The classroom walls areyellow.
7. Scientists often test their hypothesis with validcontrolled experiments. Which of these is part of acontrolled experiment?
A. Change at least two independent variables at atime.
B. Change only one independent variable at a time.
C. Keep all variables constant.
D. Change as many independent variables aspossible.
and the answer is……
B. Change only oneindependent variable at a time.
8. A variable the scientist measures in anexperiment in order to study how a systemwas affected is called a(n)
A. independent variable.
B. dependent variable.
C. manual variable.
D. controlled variable
and the answer is……
B. dependent variable.
The graphs show the results of two separate experiments on the samespecies of plant. Students now want to determine how the use oftemperature and water affects the growth of this plant.
9. Which conditions should be used for the most growth?
A. 20°C, 10 mL/day
B. 25°C, 35 mL/day
C. 30°C, 45 mL/day
D. 35°C, 20 mL/day
and the answer is……
D. 35°C, 20 mL/day
10. The diagram shows a set up for a plant investigation. Whichvariables are most likely being tested and measured?
A. Hours of light exposure and bean growth
B. Plant species and light exposure
C. Soil volume and bean growth
D. Soil pH and bean growth
and the answer is……
D. Soil pH and bean growth
11. Observations that deal with a number oramount are called
A. manipulated observations
B. quantitative observations
C. qualitative observations
D. operational observations
and the answer is……
B. quantitative observations
12. An organized way to collect and recordscientific observations is using a(n)
A. experiment
B. inference
C. data table
D. graph
and the answer is……
C. data table
13. A possible explanation for a set ofobservations or answer to a scientificquestion is called a(n)
A.prediction
B.hypothesis
C.theory
D.law
and the answer is……
B.hypothesis
14. What is the independent variable in thisexperiment?
A.number of chirps per minute
B.cricket number
C.environmental temperature
D.type of cricket
and the answer is……
C. environmental temperature
15. Which type of scientist studies the subjectillustrated here?
A. a life scientist
B. an Earth scientist
C. a physical scientist
D. none of these
and the answer is……
C. a physical scientist
16. Why is cell theory called ascientific theory?
A.It is a rule that describes apattern in nature
B.It is an explanation based onmany observations andinvestigations
C.It is information gathered byusing the senses
D.It is a statement of what willhappen next
and the answer is……
B. It is an explanation basedon many observations andinvestigations
17. Which is the application of science tomake tools that people can use?
A.technology
B.control
C.a trial
D.safety
and the answer is……
A. technology
18. Which of these is true of scientificmethods?
A. Conclusions are drawn at the beginningof the process.
B. The problem needs to be stated at thebeginning of the process.
C. It is not important to form a hypothesis.
D. Data can be analyzed in only one way.
and the answer is……
B. The problem needsto be stated at thebeginning of theprocess.
19. What describes thebehavior of somethingin nature?
A. theory
B. law
C. hypothesis
D. conclusion
and the answer is……
B. law
20. Constants in an experiment
A. do not change
B. always change
C. sometimes change
D. are seldom used
and the answer is……
A. do not change