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IdentifyingpartsofanExperimentWorksheetmadebyme.docxIdentifying parts of an Experiment Worksheet
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Directions: For each of the following experiments identify the Independent variable, dependent variable, the control group (if present/mention if missing), and a few constant variables.
1. Darren is studying the effect of increased carbon dioxide on plant growth. He sets up four tanks (terrariums). Each tank has the same type of plant, same potting soil, same amount of water, same amount of sunlight. The first tank has normal levels of Carbon dioxide. The second tank has 25% more carbon dioxide, the third 50% more and the fourth 100% more. Darren records plant height after each week for a four-week period.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
2. Sebastian is investigating which types of soil erode the slowest and fastest. He sets up three trays (that are slightly angled on one end so they are sloped). Each tray gets the same amount of soil, same amount of water and has the same level of incline. The first tray has sand. The second tray has potting soil and the third tray schoolyard dirt. Sebastian pokes several holes in a cup, fills the cup with water and slowly sprinkles the three soils to see which washes away fastest. He records how long it takes for the soil to be washed away.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
3. Allison is growing a few beds of sunflowers and giving each group different amounts of water for a period of five weeks to see if it affects their growth. All of the groups receive the same amount and type of soil and receive the same amount of sunlight. She gives the first sunflower group 300 extra milliliters of water a day. The second receives 200 extra milliliters of water a day and the third bed of sunflowers receives no extra water and obtains water only natural ways. Allison records the heights of the sunflowers after each week.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
4. Rene wants to find out which mouthwash works best. She decides to do a short experiment. Using bacteria from her mouth, she places samples on special plates in the laboratory. Next she placed five drops of different mouthwashes on bacteria on each plate and left one plate untreated and recorded observations.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
5. Alejandro decides he wants to raise the biggest goldfish in the world as he’s very bored at home. He ventures out into world and picks up four small fish tanks of the same size. He buys twenty goldfish of nearly the same size. He separates the fish evenly into the tanks and records each tiny goldfish’s weight. He decides to feed the first tank once a day, the second tank two times a day, the third tank three times per day and the fourth tank four times per day. Each feeding is the same amount of food. He records each goldfish weight at the end of the day each day for 3 weeks.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
6. Francesco placed pieces of meat in several jars. He divided the jars into two groups. He covered the first group of jars with fine cloth. He left the second group of jars uncovered. Redi observed the jars for several days. He saw flies on the cloth of the covered jars, and he saw flies laying eggs on the meat in the uncovered jars. Maggots appeared only on the meat in the group of jars left uncovered.
a. Independent variable:
b. Dependent variable:
c. Control Group:
d. Constant:
