Activity 3 IDENTIFYING VARIABLES Objective: Identify the control, independent and dependent variables.
Instructions: For the following experiments, identify the (IV) independent variable, (DV) dependent variable, (CG) control group. Number 1 is done for you.

1. You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives regular water. After a two- week period, the height is measured.
IV - The amount of salt.
DV - The height of plant.
CG - 4th plant that receive pure water

2. There wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measure once a week.
IV -
DV -
GC -

3. One tank of goldfish is fed the normal amount of food once a day, a second tank is fed a twice, and a third tank four times a day during a six-week study. The fish's body fat is recorded daily.
IV -
DV -
CG -

4. Strawberry plant clones are given differents amount of water for a 3-week period. First strawberry plant receives 400 milliliters (ml) a day. The seocond strawberry plant receives 200ml a day. The third strawberry plant does not receive any extra water; this plant only receive natural ways of receiving water. The height of the strawberry plants is recorded daily.
IV -
DV -
CG -

5. Emelie is working on a science project. Her task is to answer the question: "Does Rogooti (a hair cream, sold on TV) affect the speed of hair growth (in length)". Her family is willing to volunteer for the experiment.
IV -
DV -
CG -


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