Nature of Science Review

Marcia did an experiment to find out whether tulips grow faster under fluorescent lighting or incandescent lighting. Under flourescent lighting, Marcia's plants grew 1.5 cm taller in two months. She gave her notes to Alex, who did the same experiments with similar results. Which term describes Alex's experiment?

• plagiarism

• replication

• pseudo science

• repitition

Identifying the Test (Independent) Variable and Outcome (Dependent) Variable in an experiment will help you interpret results. What is the difference between the Test (Independent) and the Outcome (Dependent) Variable in an experiment?

• Test Variable changes due to the outcome variable, the Outcome Variable is what is measured in an experiment.

• Test Variable changes due to the outcome variable, the Outcome Variable is what stays the same in an experiment.

• The Test Variable is what we change in an experiment, and the Outcome Variable is what changes as a result of that change.

• The Test Variable is what is measured in an experiment, and the Outcome Variable is what changes as a result of that change.

Tags

NGSS.MS-PS2-2

What is the difference between a scientific theory and a scientific law?

• A theory is a well-tested range of representations and a law is a concrete physical representation.

• A theory is a well-tested range of observations of why something works and a law is a well-tested concrete explanation how things work

• A theory is a well-tested range of observations of how something works and a law is a well-tested concrete explanation of why things work

• A theory is a hypothesis that is yet to be proven false and a law is a hypothesis that will always be true.

A prevailing theory about heredity is challenged by newly discovered information from a few experiments. As a result, what might happen to the scientific knowledge about heredity?

• A new theory will immediately be established.

• All that is known about heredity will be erased

• Nothing because scientific knowledge cannot change once it is established.

• Scientific knowledge may change and grow over time.

What is the best definition of the term "theory", as it’s used in science?

• What is the best definition of the term "theory", as it’s used in science?

• It is well tested set of ideas that explains events that occur in nature.

• A theory is based on laws that can be proven true.

• It is a hypothesis that has been confirmed

What is the difference between a scientific theory and a scientific law?

• A theory is a well-tested range of representations and a law is a concrete physical representation.

• A theory is a well-tested range of observations of why something works and a law is a well-tested concrete explanation how things work

• A theory is a well-tested range of observations of how something works and a law is a well-tested concrete explanation of why things work

• A theory is a hypothesis that is yet to be proven false and a law is a hypothesis that will always be true.

Scientists need to know how gravity acts on a space shuttle so they can put the space shuttle into orbit. They use an equation that describes how gravity relates to the mass of two objects and the distance between the two objects. Which term describes this equation?

• observation

• model

• scientific law

• scientific theory

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

Which of the following describes a scientific law?

• Motorists may not travel faster than the posted speed limit.

• The net force on a vehicle is equal to its mass times its acceleration.

• Drivers must have a valid driver's license to operate a motor vehicle.

• Vehicles require one car length per 10 miles per hour of speed to safely stop.

Tags

NGSS.MS-PS2-1

Which phrase defines a scientific theory?

• A well supported explanation

• An untested idea

• An educated guess

• An accepted description

Scientists conduct many types of scientific investigations. Their efforts often include fieldwork, surveys, models, and experiments. Which statement about scientific investigations is true?

• Their primary purpose is to compare or describe the world.

• They rarely involve the collection of data under controlled conditions.

• They follow exactly the same steps because there is only one scientific method.

• They include multiple trials to increase the consistency of the data that are collected.