1) Which variable is deliberately changed in an experiment? a) dependent b) independent c) control 2) What is the dependent variable in an experiment? a) The variable you measure b) The variable you keep the same c) The variable you deliberately change 3) Why are control variables important in an experiment? a) To ensure the independent variable causes the effect 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 height of the plant after 1 week d) The number of plants tested 6) In an experiment testing how temperature affects enzyme activity, which variable should be kept constant? a) The temperature b) The enzyme concentration c) The rate of reaction d) The product formed 7) If an experiment is investigating how pH affects seed germination, what is the dependent variable? a) The pH of the solution b) The type of seed used c) The number of seeds germinated d) The volume of solution added 8) What is the dependent variable in an experiment investigating the effect of light intensity on photosynthesis? a) The type of plant used b) The distance of the light source c) The rate of oxygen production d) The color of the light 9) In an experiment to measure the rate of osmosis in potato cylinders, which of the following is a control variable? a) The concentration of the solution b) The type of potato used c) The mass of the potato before immersion d) The percentage change in mass 10) In an experiment investigating the effect of carbon dioxide concentration on photosynthesis, what would you measure to determine the rate of photosynthesis? a) The temperature of the environment b) The rate of carbon dioxide absorption c) The number of bubbles produced in water d) The pH of the solution 11) In an investigation on the effect of light colour on photosynthesis, what could be a control variable? a) The colour of the light b) The rate of oxygen production c) The type of plant used d) The distance between the light and the plant 12) In an investigation on the effect of light colour on photosynthesis, what is the independent variable? a) The colour of the light b) The rate of oxygen production c) The type of plant used d) The distance between the light and the plant

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