Task Cards Answer sheet 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 A student constructs several terrariums to grow plants. Each terrarium is exposed to a different amount of sunlight each day. In order to determine the ideal amount of sunlight, which of the following variables must be held constant? Growth Rate Amount of sunlight received Type of Plant
2 A student hypothesizes that green algae will grow fastest when exposed to blue light. To test this hypothesis, the student should design an experiment with which independent variable? Color or Light Amount of light per day Color of algae
3 Sandy is conducting an investigation to find out which food his dog likes best. Which is the dependent variable in his investigation? Color of the dog s dish Amount of food eaten The type of food given
4 Avery designed an experiment to determine which type of soil absorbs the most water. To ensure that experiment results in valid data, each container must Contain the same amount of soil Contain soil from the same place Be tested by the same person
5 In an experiment, Logan tested to see how the size of rocks affects the amount of dirt that washes away when water flows downhill. Which variable is the independent variable? Amount of water Type of dirt Size of the rocks
6 Two students wanted to find out which of their toy race cars would go the farthest down a ramp. Which of these should be held constant if they want a fair test of their cars? Height of the ramp The weight of the ramp The length of the cars
7 You design an experiment to test the effect of temperature on bacterial growth. You use three bacteria cultures under three heat lamps at different temperatures. What is the dependent variable in this experiment? Bacterial Growth temperature Length of the experiment
8 A student plans to conduct an experiment to determine how a change in the ph of water affects the population growth rate of algae. To ensure that her experimental data is valid, she should Vary the temperature Hold the acidity constant Use the same species of algae
9 A medical researcher hypothesizes that a new medication can reduce high blood pressure. Which of these would most likely be the dependent variable in a study involving this medication? Blood pressure of the group The ages of the group The number in the group
10 In an experiment about growth, some snapdragon seeds were placed in dishes lined with moist paper towels at differing temperatures. Which of these is the independent variable in this experiment? The number of sprouts The type of seed The temperature of each dish
11 The hungrier a baby gets, the louder she cries. Identify the Independent variable Dependent variable Constant(s)
12 Does the surface area of a sponge affect the rate of evaporation? Identify the Independent variable Dependent variable Constant(s)
13 Does one brand of nail polish dry faster than another? Identify the Independent variable Dependent variable Constant(s)
14 Does warm water or cold water dissolve salt faster? Identify the Independent variable Dependent variable Constant(s)
15 What brand of laundry detergent removes grass stains best? Identify the Independent variable Dependent variable What operational definitionwould you give for best?
16 Develop an experiment with the following variables: Independent Variable: size of paper Dependent Variable: distance plane flies Controls: type of paper, force of throw Write a Problem Hypothesis