Variables

The variable that is changed during an experiment is known as the ___________________ variable.

• independent

• controlled

• dependent

The variable that remains the same in an experiment is known as the __________________ variable.

• independent

• controlled

• dependent

The variable that is measured at the end of the experiment is known as the _________________ variable.

• independent

• controlled

• dependent

True or False: an experiment should have many independent variables.

• True

• False

An experiment is being done to determine how light affects the growth of pea plants. One plant is placed in full sunlight, the second in a shaded area and the third in a dark closet. What is the independent variable?

• Type of soil

• Amount of light

• Type of plant

An experiment is being done to determine how light affects the growth of pea plants. One plant is placed in full sunlight, the second in a shaded area and the third in a dark closet. What is the dependent variable?

• Growth of the pea plants

• Amount of light

• Type of plant

What is a controlled experiment?

• It is an experiment in which one variable changes and the rest of the variables are kept the same.

• It is an experiment in which all the variables change and only one variable is kept the same.

Why should we test one variable at a time during an experiment?

• It is what has always been done.

• It keeps the experiment fair and achieves accurate results.

• The results are better.

Ayah conducted an experiment using the scientific method. She decided to test if the amount of water affects the growth of tomato plants.

Ayah had 2 tomato plants. She made sure that they had the same amount of soil and were placed in sunlight. Ayah then gave the 1st tomato plant 1 cup of water and the 2nd tomato plant 10 drops of water. She then measured the height of the tomato plants and recorded her results for 2 weeks.

What are the controlled variables in this experiment? Choose all correct answers.

• The type of plant

• The amount of soil

• The place the plants were placed in

Ayah conducted an experiment using the scientific method. She decided to test if the amount of water affects the growth of tomato plants.

Ayah had 2 tomato plants. She made sure that they had the same amount of soil and were placed in sunlight. Ayah then gave the 1st tomato plant 1 cup of water and the 2nd tomato plant 10 drops of water. She then measured the height of the tomato plants and recorded her results for 2 weeks.

What is the independent variable in this experiment?

• The amount of water

• The amount of soil

• The place the plants were placed in