Key 1Hour of Sunlight 3 Hours of Sunlight 6 Hours of Sunlight 9 Hours of Sunligh
ID: 142921 • Letter: K
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Key 1Hour of Sunlight 3 Hours of Sunlight 6 Hours of Sunlight 9 Hours of Sunlight 160 1. Use this chart to answer the following questions. (Spoints) a. What elements is missing from this graph? b. Using the information provided to you, label the graph Sam wished to investigate how fertilizer run-off afflects the streams. He set his experiment up in this way. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker he added 5 ml of water from an aqarium which contained a large concentration of algae. The beakers were placed under a grow light which was timed to provide 12 hours of light each day, Liquid fertilizer was added to the beakkers in the following amounts: Beaker A 8 ml fertilizer, Beaker B 6 mil fertilizer, Beaker C 4 mil fertilizer, Beaker D 2 mil ferbilger, and Beaker E-no fertilizer. Each week a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present. of aigae in freshwater lakes and 2. What is the independent variable in this experiment? (5 points) A. Hours of daylight B. Amount of fertilizer C. Number of algal cells D. Amount of water 3. What is the dependent variable in this experiment? (5 points) A. Amount of fertilizer B. Number of algal cells C. Hours of daylight D. Size of the beakers 4. Which of the following is NOT a controlled variable in this experiment? (5 points) A. Amount of aquarium water B. Size of the beakers C. Amount of fertilizer D. Amount of light 5. Which of the following is the control group for this experiment? (5 points) A. Beaker C B. Beaker C. Beaker A D, BeakerE E. Beaker DExplanation / Answer
1a. Labeling on the X-axis is missing.
b. X-axis = Days after planting
Y-axis = Plant height
2. Independent variable = Whose variation does not depend upon the other factor
= Amount of fertilizer
3. Dependent variable = Whose variation depends upon the other factor
= Number of algal cells depends upon the availability of the fertilizer
4. Controlled variable = The variable which is not altered throughout the experiment
The amount of fertilizer is different in different beakers. So, it is not a controlled variable.
5. Beaker E has no fertilizer. It serves as a negative control.
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