1) A student wants to test the effect of sunlight on the growth of bean plants. She places one group of plants in full sunlight and another group in a shaded area. After 3 weeks, she measures how tall each plant has grown. What is the independent variable? a) amount of sunlight b) height of plants c) type of plant d) length of experiment 2) A student wants to test the effect of sunlight on the growth of bean plants. She places one group of plants in full sunlight and another group in a shaded area. After 3 weeks, she measures how tall each plant has grown. What is the dependent variable? a) Amount of water given b) height of the plants c) type of soil d) temperature of the room 3) A researcher tests whether the amount of sleep affects how quickly people react to a flashing light. Group A sleeps for 8 hours, Group B for 6 hours, and Group C for 4 hours. The next day, all groups take a reaction time test. What is the dependent variable? a) number of people in each group b) reaction time to the flashing light c) amount of sleep d) type of test 4) A researcher tests whether the amount of sleep affects how quickly people react to a flashing light. Group A sleeps for 8 hours, Group B for 6 hours, and Group C for 4 hours. The next day, all groups take a reaction time test. What is the independent variable? a) type of test given b) reaction time c) number of hours of sleep d) time of day the test is given 5) A student investigates how temperature affects the amount of sugar that dissolves in water. They add sugar to water at different temperatures (cold, room temperature, hot) and measure how much dissolves. What is the independent variable? a) amont of sugar used b) type of sugar c) temperature of the water d) size of the container 6) A student investigates how temperature affects the amount of sugar that dissolves in water. They add sugar to water at different temperatures (cold, room temperature, hot) and measure how much dissolves. What is the dependent variable? a) time of day the experiment is done b) amount of sugar dissolved c) temperature of the air d) type of water used

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