Repetition and Replication Made Easy Assessment

1. The following statements were taken from the procedures of four different investigations. Which statement is an example of repetition?

Investigation / Statement
1 / Measure the densities of four different substances.
2 / Calculate the mass of a penny, a nickel, and a dime using a triple beam balance.
3 / Read about the winning science fair project and replicate it.
4 / Conduct four trials of counting how many plants are produced when creating the exactconditions.
  1. Keesha did an experiment to study the rate of photosynthesis in the water plant Elodea. She placed a piece of Elodea in a beaker of water and set the beaker 10 centimeters (cm) from a light source. Keesha counted the bubbles released from the plant every minute for five minutes (min). She repeated the process two more times. First, she moved the light to 20 cm from the beaker, and then she moved the light to 30 cm from the beaker. If Keesha’s lab partner wanted to conduct Keesha’s investigation for accuracy what would this be an example of?
  1. Repetition
  2. Theory
  3. Replication
  4. Laws

Read and analyze the following scenarios. Determine whether each scenario is an example of repetition or replication and explain why.

  1. Jennifer has taught her pet rat to run a maze. She thinks that the rat will go faster if she puts its favorite treat at the end. She has the rat run the maze ten times with the favorite treat and ten times with a regular food pellet. She uses a stopwatch to measure how long it takes for the rat to get to the reward.
  1. Kevin was given a set of 5 cubes. He calculated the densities of each to determine the type of cube. The densities were really close to each other, he thought about repeating his investigation but decided he’d asked his friend John to do the same experiment and see if he gets the same results.
  1. Jenna baked chocolate chip cookies that wound up looking like muffins. She asked Keesha to use the same directions and see if her cookies also look like muffins.
  1. Mike was mixing a batch of glue and borax solution to make silly putty and discovered a new substance that glows in the dark. He gave John his specific amounts of ingredients and the steps of his procedure. He asked John to try the experiment to see if he gets the same results.
  1. Tom measured the distance of a ramp. He then rolled a marble down the inclined surface ten times and recorded the time it took the marble to reach the bottom.
  1. A scientist discovered a new substance that cured diabetes in a rat. This substance was tested by 100 other scientists with the same result.
  1. Lizzette is investigating the effects of sunlight on plant growth. Every day for 2 weeks she puts a plant outside for 10 hours. She measures the plant's height daily at noon and records the data in her journal.
  1. Jerry bounces a ball, dropping it from the same height and using the same force each time. He does this on a flat concrete surface 3 times and records how high the ball bounced each time in his notebook. He then repeats the experiment on a carpeted surface and a dirt surface, each time doing 3 trials.
  1. Kurex Labs is testing a new cancer medication in the United States, Italy, and China. Each testing facility will provide 100 patients with the new treatment for 3 months. Lab personnel will document the medication's effectiveness.

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