Practice of Science

This variable is the one thing that changed on purpose...

• Dependent Variable

• Control

• Independent Variable

Identify the dependent variable according to this graph.

• Seed Type

• Number of Bird Species

• Sunflower and Sorghum

• Sunflower

Tags

NGSS.MS-LS2-1

SC.7.N.1.2

Scientists frequently repeat the experiments of others scientists. Why is this important in science?

a. Scientists often ask each other for help in performing experiments.

b. Replication of experiments helps to confirm and verify results.

c. Scientists frequently perform other scientists’ experiments in order to practice their technique.

d. Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

• a

• b

• c

• d

SC.6.N.1.2

Experiments are often repeated many times by the same or different scientists. What is the most important reason more than one scientist should conduct an investigation using the same methods?

a. If the results are the same, replication of the investigation helps to confirm the results.

b. The competition makes the scientists work more carefully.

c. More than one scientist is interested in the problem.

d. Different scientists might perform the experiment differently.

• a

• b

• c

• d

The variable that you may change in the experiment

• Independent Variable

• Dependent Variable

Variable measured during the experiment

• Independent Variable

• Dependent Variable

What is the relationship between dependent and independent variables?

• The independent variable changes based on the dependent variable

• The dependent variable changes based on the independent variable

• the are not related

• they are the same

Information that is obtained through observation or experimentation.

• empirical evidence

• observation

• prediction

• hypothesis

Tags

NGSS.MS-LS1-4

NGSS.MS-LS2-4

An experiment was designed to determine the effect of fertilizer on plant growth. Two groups of plants were grown under identical conditions except one group was watered with a dilute fertilizer solution and one was received water without fertilizer. The group of plants without the fertilizer is known as the

• abiotic factor

• control

• variable

An idea or explanation that can be studied or tested

• Analyze

• Hypothesis

• Evidence

• Qualitative Data