Question

understanding variables and constants in science directions: choose the correct answer from the choices for each question. 1. what is an independent variable in an experiment? a. the variable that is measured or observed b. the variable that remains constant c. the variable that the experimenter changes d. the variable that depends on other factors 2. which of the following best describes a dependent variable? a. it is manipulated by the researcher b. it remains the same throughout the experiment c. it responds to changes in the independent variable d. it has no effect on the experiments outcome 3. in a plant growth experiment, if sunlight exposure is the independent variable, what would likely be the dependent variable? a. the amount of water given to the plants b. the type of soil used c. the height of the plants d. the temperature of the room 4. what is a constant in an experiment? a. a factor that changes regularly b. a variable that is being tested c. a factor that is kept the same throughout the experiment d. the final result of the experiment 5. in an experiment testing how different amounts of fertilizer affect tomato plant growth, what is the independent variable? a. the height of the tomato plants b. the amount of fertilizer used c. the amount of sunlight received d. the type of tomato plant 6. which of the following is an example of a constant in a baking experiment testing different amounts of sugar in cookies? a. the amount of sugar used b. the baking time and temperature

Explanation:

1. The independent variable is manipulated by the experimenter. So for question 1, the answer is based on this definition.
2. A dependent variable changes in response to the independent variable. This helps answer question 2.
3. In a plant - growth experiment with sunlight as the independent variable, plant height is likely to be affected by sunlight, making it the dependent variable for question 3.
4. A constant is a factor kept the same throughout the experiment, answering question 4.
5. In the tomato - plant growth experiment, the amount of fertilizer is what the experimenter changes, so it's the independent variable for question 5.
6. In a baking experiment testing sugar amounts, baking time and temperature are usually kept the same and are constants for question 6.

Answer:

1. c. The variable that the experimenter changes
2. c. It responds to changes in the independent variable
3. c. The height of the plants
4. c. A factor that is kept the same throughout the experiment
5. b. The amount of fertilizer used
6. b. The baking time and temperature