Experiments Practice1

What is the primary characteristic of a controlled experiment?

• Multiple variables are changed simultaneously.

• Only one variable is changed or tested at a time.

• All variables are allowed to change freely.

• It is an experiment without any variables.

In the pea plant experiment, what is the independent variable?

• The amount of water given to the plants.

• The type of soil used for the plants.

• The source of light provided to the plants.

• The height of the pea plants.

Which of the following must be kept the same in the pea plant experiment to ensure accurate results?

• The type of light source.

• The height of the plants.

• The size of the pots and type of soil.

• The amount of peas produced.

Why do scientists use repetition in their experiments?

• To make the experiment longer and more complex.

• To ensure that only one variable is changed.

• To identify abnormal data or outliers.

• To allow other scientists to copy their experiment.