Science Independant Variable, Dependent Variable, and controlled variables

Identify the independent variable, dependent variable, and a controlled variable: Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment.

IV: Different rose bushes DV: number of flowers on each bush CV: Water, Sun, Soil, etc.

Identify the independent variable, dependent variable, a controlled variable, and a control group: Pea plant clones are giving different amounts of water for three week period. The first pea plant receives 400 milliliters a day. The second pea plant receives 200 milliliters a day. The third pea plant receives 100 milliliters a day. The fourth pea plant does not receive any extra water: the plant only receives natural ways of receiving water. The heights of the pea plants are recorded daily.

IV: different amounts of water given to the pea plants DV: heights of pea plants CV: amount of sun CG: plant with no extra water

Identify the independent variable, dependent variable, a controlled variable, and a control group: You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two- week period, the height is measured.

IV: different concentrations of salt solutions DV: height of each plant CV: amount of sun, type of soil, indoors or outdoors, etc. CG: fourth plant recieving pure water

Identify the independent variable, dependent variable, a controlled variable, and a control group: Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week.

IV: different humidity levels DV: heights of trees CV: amount of sun CG: tree that is left outside in normal conditions

Identify the independent variable, dependent variable, and a controlled variable: You want to test which size of soccer ball is easiest to juggle with your feet. You test a size 3, size 4, and size 5 ball. You count the seconds the ball stays in the air for each of the trials. You allow yourself to use both of your feet, knees, and head to juggle the ball.

IV: different sizes of soccer balls DV: amount of time that the ball stays in the air CV: person juggling ball

Identify the independent variable, dependent variable, a controlled variable, and a control group: One tank of gold fish is fed the normal amount of food once a day. A second tank is fed twice a day. A third tank is fed four times a day during a six week study. The fish's weight is recoded daily.

IV: different tanks of goldfish DV: weight of fish CV: size of tank, amount of fish in tank, etc CG: tank of goldfish fed the normal amount of food

Dependent Variable

a variable that is dependent on other factors; cannot be changed by the independent variable

Independent Variable

a variable that stands alone and isn't changed by the other variables you are trying to measure; causes a change in the dependent variable

Controlled Variable

a variable that stays the same (controlled) throughout the entire experiment