1*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. The number of flowers is the . * a*independent variable
b*dependent variable
c*control variable

2*Plants grow best in black soil. What is the dependent variable *
a*Plant Growth
b*Type of Soil
c*Amount of water

3*Cigarette smoking increases the risk of lung cancer. What is the independent variable? *
a*Smoking and not smoking cigarette
b*Lung cancer

4*Students who study perform better in school. What is the dependent variable? *
a*Study
b*Performance
c*Grade (class) student is in

5*Plants grow best in black soil. What is the controlled variable? *
a*Plant growth
b*Type of soil
c*Amount of water

6*Lemon trees receiving the most water produced the most lemons. Which of the following is the controlled variable? *
a*lemon trees
b*amount of water
c*amount of lemons

7*Alex wanted to find out what toothpaste made the teeth the cleanest. Everyday she brushed her teeth with a different product and then took a plaque test to see how much plaque was left. She used Crest, Colgate, Close-Up and water. The independent variable is the . *
a*type of toothpaste
b*plaque test result
c*Alex's teeth

8*Students who study perform better in school. What is the controlled variable? *
a*Study
b*Performance
c*Grade (class) student is in

9*Hummingbirds are attracted to the color blue. What is the independent variable. *
a*Attraction
b*Color

10*The independent variable is: *
a*Changed
b*Measured
c*Kept the same

11*Mike wanted to see what kitchen cleaner worked best for cleaning counters. He used Lysol, Clorox and Pinesol and just water. For each cleaner, he put 5ml of grape juice on the counter, sprayed the cleaner and wiped it with one paper towel. Which is the dependent variable? *
a*type of cleaner
b*cleanlinest of kitchen counter
c*type of paper towel

12*The higher the temperature of the air in the oven, the faster a cake will bake. The temperature of the oven is the . *
a*independent variable
b*dependent variable
c*control variable