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Hypotheses, Theories, and Laws Answers

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A testable hypothesis could be formed from which question?

A
Are bass more active in the daytime than at night?
B
When whales jump out of water, are they happy?
C
Are red tulips prettier than tulips of other colors?
D
Why are gerbils more popular as pets than hamsters are?
2
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Which is the correct order in the scientific process?

A
ask a question ® form a hypothesis ® make an observation
B
ask a question ® make an observation ® form a hypothesis
C
make an observation ® form a hypothesis ® ask a question
D
make an observation ® ask a question ® form a hypothesis
3

How should you test a hypothesis?

A
by writing a mathematical equation
B
by making a single observation
C
by performing a controlled experiment
D
by answering a series of questions
4

In which situation would new technology be most likely to cause a change in an existing theory about new structures in a cell?

A
The new technology makes it possible to detect and analyze a structure more rapidly.
B
The new technology allows scientists to confirm the presence of an existing structure in a cell.
C
The new technology makes it possible to produce additional structures that were not previously there.
D
The new technology allows detection of a structure that could not be detected previously.
5

In the early days of germ theory, contagious diseases were thought to be caused only by fungi or bacteria. In the 1890s, Dmitri Ivanovski filtered extracts from diseased tobacco plants and discovered that the disease could be transmitted to new plants through the filtrate. He hypothesized that something smaller than bacteria or fungi was responsible for the transmission of the disease. Which best explains how Ivanovski’s work led to a change in the germ theory?

A
He tried to promote his hypothesis as a law.
B
He used a new experimental method to test his hypothesis.
C
He used a more powerful bacterial strain than other scientists had.
D
He obtained results that confirmed what other scientists were thinking.
6

Which situation would result in a theory being replaced rather than revised?

A
Additional experiments are performed that confirm the existing theory.
B
New information is discovered that contradicts the existing theory.
C
Scientists disagree on how to revise a theory, so they replace it instead.
D
New experiments to confirm the theory yield inconclusive results.
7

The statement “force equals mass times acceleration (F=ma)” is Newton’s second law of motion. Why is this a law rather than a theory?

A
It states, rather than explains, the relationship between the variables.
B
It cannot be proven, whereas a theory can be proven.
C
It may be revised if new information shows that the relationship has changed.
D
It was classified as a law because it is related to other similar discoveries.
8

Our current understanding of evolution is called a theory because it has been

A
supported repeatedly as new discoveries have been made.
B
proven to be exactly true as originally proposed.
C
corroborated by data that were gathered during a single experiment.
D
developed from the postulates of many scientists.
9

Which occurs directly before forming a hypothesis?

A
proposing a law
B
drawing a conclusion
C
developing a testable question
D
analyzing experimental data
10

The development of a new experimental method is most likely to change a theory if it makes it possible to

A
analyze samples when they are frozen.
B
perform the experiment in a different lab.
C
obtain and analyze results more quickly.
D
study a larger sample size than before.

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