Plan a fair experiment

Grade 6 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Question, Does the amount of light change how tall bean plants grow?; what is changed, blank; what is measured, blank. Ari tests whether the amount of light changes how tall bean plants grow. What is the independent variable?

   • The kind of soil, which stays the same
   • The amount of light each plant gets
   • How tall the bean plants grow by the end
   • The color of the pots on the shelf
2. 2.

   Kira times how long sugar takes to dissolve in cold and in warm circle water. Which pair names the variables correctly?

   • Changed: amount of sugar; measured: water temperature
   • Changed: the glass; measured: the spoon
   • Changed: water temperature; measured: time to dissolve
   • Changed: time to dissolve; measured: water temperature
3. 3.

   Luz tests whether salt makes ice cubes melt faster. Which plan is fair?

   • Test one plate of salted cubes and nothing else
   • Big cubes get salt; small cubes get no salt
   • Salted cubes in the sun; plain cubes in the cool shade
   • Same-size cubes in the same room, salt on one plate
4. 4.

   Investigation card: what is changed, magnet A or B; what is measured, paper clips picked up. Milo compares two magnets by counting how many paper clips each picks up. Which choice would make the test unfair?

   • Using the same box of paper clips for both
   • Using bigger paper clips for one magnet
   • Counting the clips the same way each time
   • Testing both magnets on the same table
5. 5.

   Question, Does light change plant height?; hypothesis, blank. Which is a testable hypothesis for Noah's plant-and-light experiment?

   • Plants are the nicest living things to see in a garden
   • Plants like light because it makes them happy
   • Will the plants grow?
   • If a plant gets more light, then it will grow taller
6. 6.

   Which hypothesis can Pia test with a ball and a meter stick?

   • Balls bounce because they want to go back up
   • If the drop height is greater, the ball will bounce higher
   • Bouncing a ball is a good game
   • Red balls are more fun to bounce than blue balls or green ones
7. 7.

   Ren will test sugar in cold and warm circle water. Which hypothesis fits the experiment?

   • Warm water is nicer than cold water
   • If the water is warmer, sugar will dissolve faster
   • If the glass is blue, sugar will dissolve faster
   • Sugar is better than salt

8. Read this first

   Use this

   Two rows of bean plants on a sunny shelf: one row watered with plant food mixed in, one row with plain water.

9. 8.

   Tala tests whether plant food helps bean plants grow. Which group is the control group?

   • The plants given plain water, with no plant food
   • Plants in a dark closet given plant food
   • No control is needed for this test
   • The plants given plant food
10. 9.

    Why does Zee include a plate of ice cubes with no salt?

    • To make the test take longer to finish
    • To compare melting with and without salt
    • It is not needed; the salted plate shows the answer
    • To use up the extra ice in the freezer

11. Use this

    A jar of water and two piles of bean seeds. Investigation card: what is changed, soaked or dry; what is measured, days to sprout.

12. 10.

    Esme wants to know whether soaking seeds overnight helps them sprout sooner. Which plan has a control group?

    • Soak all 20 seeds, then plant them
    • Soak 10 seeds; plant the dry ones in different soil
    • Soak 1 seed and plant it by itself
    • Soak 10 seeds and keep 10 dry, then plant all 20