How Do Scientists Design Experiments

The parts of an experiment that can be controlled or changed

• variables

• consistent

• scientific method

• hypothesis

When a scientist designs an experiment, he is working like a detective.

• True

• False

• Maybe

Which of the following variables should NOT be included if you want to test if moisture in the soil helps bean seeds sprout more quickly?

• amount of moisture or water

• type of soil

• amount of sunlight

• number of flowers

Controlled variables are the things that always change in the experiment.

• True

• False

A scientist will repeat his experiment many times to make sure that the results are the same or consistent.

• True

• False

You want to know if sunlight affects the growth of plants, what are the variables that you will include in the experiment. Choose 4.

• amount of sunlight

• amount of water

• amount and type of seeds

• height of the fence

• type of soil

Liza set up same type of pot, same type and amount of soil, same amount of sunlight, same number of seeds, and same amount of air, but she watered the first pot daily and the other pot once only. What problem is she trying to solve?

• Does sunlight affect the plant's growth?

• Does soil affect the plant's growth?

• Does water affect plant's growth?

• Does air affect the plant's growth?