1) Which variable is changed in an experiment? a) dependent b) independent c) control 2) What is the dependent variable in an experiment? a) The variable you measure and record as data b) The variable you keep the same c) The variable you choose to change 3) Why are control variables important in an experiment? a) It helps to make sure an investigation is valid b) To create random results c) To vary the results as much as possible d) To improve the speed of the experiment 4) In an investigation into how light intensity affects plant growth, which of the following is the independent variable? a) The growth of the plant b) The light intensity c) The type of plant used d) The amount of water given to the plant 5) In an investigation into how light intensity affects plant growth, which of the following is the dependent variable? a) The type of soil used b) The light intensity c) The growth of the plant d) The number of plants tested 6) If an experiment is investigating how pH affects seed growth, what is the dependent variable? a) The pH b) The type of seed used c) The seed growth 7) If an experiment is investigating how pH affects seed growth, what is a control variable? a) The pH b) The type of seed used c) The seed growth

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