Question

Valerie wants to see if different amounts of water will affect how tall a plant grows. She puts the same type of plant in 4 cups. To each cup, she adds 100 grams of soil. To cup 1, she places 0 ml of water. To cup 2, she places 5 ml of water. To cup 3, she places 10 ml of water. To cup 4, she places 20 ml of water. She places all 4 cups by the windowsill for 7 days. At the end of the 7 days, she records the height of each plant.

Identify the following...
Constant Variable -
Independent Variable:
Dependent Variable:
Which cup is the control group?

Answer 1

The independent variable in Valerie's experiment is the amount of water added, the dependent variable is the plant height, and the control group is cup 1 with 0 ml of water.

Step-by-step explanation:

In Valerie's experiment, the independent variable is the amount of water added to each cup, and the dependent variable is the height of the plant.

The constant variable is the type of plant and the 100 grams of soil added to each cup.

To determine the control group, we look at the cup that does not receive any water. In this case, cup 1 (with 0 ml of water) is the control group.