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Dependent vs. Independent Variables
DIRECTIONS: Please list the dependent and independent variables in each of these examples.
A scientist wants to know if the amino acid thyroxine will affect weight gain in mice. He gives mice varying amounts of the amino acid and measures their weight for 3 months.
George wants to know if different colors of light will affect plant growth. He puts plants under different colors of light and measures their height for 2 months.
Lucy wanted to see if her goldfish released more ammonia when give tropical fish food or goldfish food. She separated her 30 goldfish into two groups and put them in separate tanks for this experiment. She then measured the ammonia content in each aquarium for 6 weeks.
David wanted to know if his elodea plants would grow better in warm or cold water. He divided the plants into four separate tanks with varying water temperature. He then measured plant height and counted the number of plants for 4 weeks.
Jessica wanted to see if tadpoles grow more quickly if they’re given a protein supplement. She divided 100 tadpoles of the same age and species into 2 groups. She gave one group the protein supplement with their food, while the other group she fed food only. Each week, she counted the number of tadpoles at various stages of development until they were mature frogs.