Life Chapter 1 Test

Which of the following is the best definition of science?

• the knowledge gained from careful, systematic study of the world

• learning things about the universe

• the process of studying the origins of the universe and life

• the key to all knowledge

Which of these is a universal statement?

• Scientists have never seen a living plesiosaur.

• All known plesiosaurs died many years ago.

• No plesiosaurs exist today.

• I have never seen a living plesiosaur.

Tags

NGSS.MS-LS4-1

Which of the following is a scientific observation?

• Jane looked at a drop of pond water under a microscope and saw an amoeba

• There are no Tasmanian devils living in the wild in the United States

• Based on the results, Dr. Smith decided to continue her research

• Dr. Jones wants the floor of the laboratory to be gray instead of white

A _____ is a testable statement about the solution to a problem.

• hypothesis

• conclusion

• theory

• observation

Tags

NGSS.MS-ETS1-4

What word means "an educated guess"?

• hunch

• survey

• theory

• hypothesis

"Doctors eat more strawberry jelly on their morning toast than any other flavor." Such a statement could best be verified by

• conducting a survey

• observations of doctors at breakfast

• consulting a medical book

• scientific experiment

When you arrange data so that relationships can be seen, you have _____ it.

• classified

• stratified

• verified

• analyzed

Tags

NGSS.MS-PS3-1

John wanted to do an experiment to test whether using fluoride rinse helps prevent cavities. He believed that rinsing with fluoride does help prevent cavities. John asked 20 people in his school to be in his experiment. He divided the 20 people into two equal groups. The people in the first group brushed their teeth twice a day but did not use fluoride rinse. Those in the second group brushed their teeth twice a day and used fluoride rinse once a day. After six months, all 20 people went to the dentist to find out if they had any cavities. Four people from the first group had cavities. No one from the second group had a cavity. If John discovered that six people in the group who did not use fluoride rinse had a "sweet tooth" and therefore ate a lot of sugar, what would this do to his results?

• This would affect John's results because it introduced another variable

• This would not afffect John's results beacuse this group wasn't using the fluoride rinse.

• This would not affect John's results beause sugar prevents cavities.

• This would affect John's results because it would make it impossilbe to classify the data.

To verify an answer means to _____.

• support the answer with additional observations

• make the answer into a universal statement

• use the answer to predict outcomes

• prove the answer is absolutely true

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-5

Once an experiment is completed and an answer is chosen, that answer should be _____.

• verified

• discarded

• ignored

• repeated