Living Env.Test1Review

What is the primary purpose of a controlled experiment?

• To test multiple variables simultaneously

• To eliminate all variables from the experiment

• To isolate the effect of one variable

• To prove a scientific theory

In an experiment studying the effect of fertilizer on plant growth, what is the independent variable?

• The height of the plants

• The amount of water given

• The amount of fertilizer used

• The type of plant

Which of the following is an example of a dependent variable in an experiment testing the effect of temperature on reaction rate?

• The temperature of the reactants

• The time it takes for the reaction to complete

• The type of chemicals used

• The size of the reaction vessel

Tags

NGSS.HS-PS1-5

What is the first step you should take when entering a science laboratory?

• Turn on all equipment

• Put on safety goggles

• Start your experiment immediately

• Check for safety hazards

What does the term "validity" refer to in scientific experiments?

• The accuracy of measurements

• The extent to which the experiment measures what it claims to measure

• The reproducibility of results

• The statistical significance of data

Tags

NGSS.HS-PS4-4

What is a scientific theory?

• An educated guess about how something works

• A well-substantiated explanation of some aspect of the natural world

• A hypothesis that has been proven true

• A random idea with no evidence

Which of the following is NOT a step in the scientific method?

• Formulating a hypothesis

• Conducting experiments

• Analyzing results

• Proving a theory as absolute truth

Which of the following is an example of a testable hypothesis?

• The universe is infinite

• Plants are more beautiful than animals

• Increased sunlight exposure will result in faster plant growth

• Life exists on other planets

What is the most appropriate metric unit for estimating the length of a pencil?

• Kilometer

• Meter

• Centimeter

• Millimeter

In a controlled experiment, what is the purpose of a control group?

• To provide a basis for comparison

• To introduce new variables

• To speed up the experiment

• To increase the sample size