Eduardo placed 450 mL of sand, potting soil, and a mixture of sand and soil into 3 separate 10 oz. Styrofoam cups. In each of the cups he placed a thermometer so that the bulb was 2.5 cm below the surface. He placed the 3 containers under identical heat lamps for an hour. Each cup was 15 cm below the heat lamp. The original temperature of each container was 15°C. After heating the jars in three separate trials the temperatures of the containers were as follows:


Sand: 28°C, 27°C, 26°C

Potting soil: 33°C, 29°C, 31°C

Mixture: 29°C, 29°C, 22.5°C

Which of the following is the scientific research question Eduardo is trying to answer by conducting this investigation?

How does the temperature of the soil affect plant growth?

Which type of soil holds the most heat?

Which type of container keeps plants warm?

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Kaitlin performed an investigation using pinto beans. She germinated bean seeds under three different conditions. The first one using distilled water with a pH of 7, second a solution with a pH of 5, and third a solution with a pH of 3. The beans in the distilled water served as her control group. The beans were given the same amount of light, same amount of liquid, and grown in the same containers.

Which of the following is the scientific research question Kaitlin is trying to answer by conducting this investigation?

How does the amount of light affect seed germination?

Which type of bean has the shortest germination rate?

How does pH affect the rate of germination?

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Meredith completed an investigation involving earthworms. She placed a worm on a moist paper towel and carefully marked the position of the worm on the paper towel. She placed a cardboard box over the worm and paper towel and left it undisturbed for 10 minutes. She removed the box and noted that worm had not moved from its original position. She then took a flashlight and shined it on the worm for 10 minutes. After the end of the 10 minutes she measured the distanced the worm moved in cm.

What was the purpose of Meredith’s investigation?

To determine how far an earthworm will move in 10 minutes

To determine how a stimulus (light) affects the movement of an earthworm

To determine how moisture affects the movement of an earthworm

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Pendulum Lab Procedure

  1. Cut a piece of string 10 cm, 20 cm, 30 cm, 40 cm, and 50 cm.
  2. Tie a paperclip to one end of the 10 cm string.
  3. Tape a pencil to the end of the table.
  4. Tie the other end of the string to the pencil.
  5. Tape the string in place with a small piece of masking tape.
  6. Hang three metal washers on the paperclip.
  7. Raise the washers to be level with the edge of the table.
  8. Start the stopwatch and release the pendulum.
  9. Count the number of times the pendulum makes a complete trip (a period) in 10 seconds.
  10. Record your results in your data table.
  11. Repeat this experiment for 4 more trials.
  12. Remove the pendulum from the pencil. Disassemble the pendulum by removing the washers and paper clip.
  13. Repeat steps 2-10 with the remaining lengths of string.

What was the purpose of this investigation?

To determine how length of string affects the number of cycles a pendulum swings in 10 seconds

To determine how the number of metal washers affects the number of cycles a pendulum swings in 10 seconds

To determine how the type of string affects the number of cycles a pendulum swings in 10 seconds

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