Question

multiple choice
identify the letter of the choice that best completes the statement or answers the question.

1. the work of scientists usually begins with

a. testing a hypothesis.
c. creating experiments.
b. careful observations.
d. drawing conclusions.

1. information gathered from observing a plant grow 3 cm over a two - week period results in

a. inferences.
c. hypotheses.
b. variables.
d. data.

1. a hypothesis

a. can be completely proven.
b. may be disproved by a single experiment.
c. does not have to be tested to be accepted as probably correct.
d. is a proven fact.

1. hypotheses may arise from

a. prior knowledge.
c. informed, creative imagination.
b. logical inferences.
d. all of the above

1. in science, a hypothesis is useful only if

a. it is proven correct.
c. it can be tested.
b. it can be proven incorrect.
d. the explanation is already known.

1. a controlled experiment allows the scientist to isolate and test

a. a conclusion.
c. several variables.
b. a mass of information.
d. a single variable.

1. when enough experimental data support a hypothesis, the hypothesis becomes a(an)

a. fact.
c. inference.
b. theory.
d. conclusion.

1. a theory

a. is always true.
b. is the opening statement of an experiment.
c. may be revised or replaced.
d. is a problem to be solved.

1. biology is the study of

a. the land, water, and air on earth.
c. animals and plants only.
b. the living world.
d. the environment.

1. in the metric system, the basic unit of length is the

a. centimeter.
c. millimeter.
b. kilometer.
d. meter.

1. how many centimeters are in 2.4 km?

a. 240
c. 24,000
b. 2400
d. 240,000

1. on the celsius temperature scale, how many degrees are between the freezing and boiling points of w

a. 68
c. 212
b. 100
d. 1000

Explanation:

1. Scientific work starts with observations.
2. Observed growth data is data.
3. A hypothesis can be disproven by an experiment.
4. Hypotheses can come from prior knowledge, inferences, and imagination.
5. A hypothesis is useful if testable.
6. A controlled - experiment tests a single variable.
7. Supported hypotheses become theories.
8. Theories can be revised.
9. Biology studies the living world.
10. The basic metric length unit is the meter.
11. 1 km = 100000 cm, so 2.4 km = 240000 cm.
12. On Celsius, the difference between water's freezing (0°C) and boiling (100°C) points is 100 degrees.

Answer:

1. b. careful observations.
2. d. data.
3. b. may be disproved by a single experiment.
4. d. all of the above
5. c. it can be tested.
6. d. a single variable.
7. b. theory.
8. c. may be revised or replaced.
9. b. the living world.
10. d. meter.
11. d. 240,000
12. b. 100