Ch 1 & 2 - Scientific Method & Biochemistry

Students were investigating some properties of rocks. They wanted to compare the volumes of the rocks.

Which tool should the students use to accurately measure the volume of each rock?

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A scientist investigates the effect of carbon dioxide on plant height. The scientist grows plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the independent variable in this experiment?

• the amount of carbon dioxide in each container

• the number of plants in each container

• the amount of water provided to the plants

• the height of each plant after a period of time

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Some researchers are developing a new fertilizer designed to improve the growth of plants in hot, dry climates. The fertilizer was applied to one hundred desert plants in a greenhouse. The average daytime temperature in the greenhouse was 90°F, and the humidity levels were low. Which is best for the researchers to do next?

• A compare plants that received fertilizer to similar plants that received none

• B begin selling the fertilizer to gardeners living in hot, dry climates

• C change the conditions in the greenhouse and retest the fertilizer

• D test the fertilizer on plants that are adapted to cooler climates

The students concluded that the plants grown indoors grew faster because they received better quality light than the plants grown outdoors. Which is the most likely reason this conclusion may be flawed?

• The students measured the plants at different times.

• The students should have grown different types of plants.

• The growth of the plants in each set was affected by more than one factor.

• The outdoor plants grew faster than the indoor plants.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS1-6

Students in a science class plan to investigate a factor that affects the rate at which a pendulum swings.

In which way should the students manipulate the variables to get valid results in this investigation?

• use equal string lengths and different plumb bob masses

• use different string lengths and different plumb bob masses

• use equal string lengths and the same plumb bob shapes

• use different string lengths and different plumb bob shapes

Tags

NGSS.HS-ETS1-2

Information recorded in your experiment which is used to draw a conclusion is called

• reliable

• data

• hypothesis

• observation

Tags

NGSS.HS-PS1-3

Which of the following are an important reason to do repeated trials?

• reliable

• accurate

• valid results

• reliable, accurate, and valid results

The change that is tested in an experiment.

• hypothesis

• data

• variable

• observation

Uses your senses to gather information.

• observation

• variable

• hypothesis

• data

Tags

NGSS.MS-LS1-8

The general steps used when conducting an experiment.

• observation

• variable

• hypothesis

• scientific method

Tags

NGSS.HS-LS1-3

NGSS.HS-PS2-5