Plan a fair experiment

Grade 6 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   Groups, warm: 1 spoon, stirred, cold: 3 spoons, not stirred. Esme's plan: warm circle water gets 1 spoon of sugar, cold circle water gets 3 spoons, and only the warm glass is stirred. Which fix makes it fair?

   • Use warm water in both glasses
   • Use 3 spoons in each, but stir just the warm glass
   • Use 1 spoon in each and stir both the same way
   • Keep the plan, since it already compares temperatures
2. 2.

   Groups, 1 soaked seed. Jun's plan: soak 1 seed overnight, plant it, and count the days until it sprouts. What is the best fix?

   • Soak 10 seeds, keep 10 dry, and plant all alike
   • Soak the 1 seed for longer
   • Plant the soaked seed in a sunnier spot
   • Soak 2 seeds instead of 1
3. 3.

   Table, Trials, with columns Trial 1, Trial 2, Trial 3. Luz's friend says one trial is enough if you are careful. Which response is best?

   • Disagree: each trial needs its own new hypothesis
   • Agree: more trials would change the variables
   • Disagree: repeat trials catch odd results
   • Agree: careful work has no odd results

4. Read this first

   Bean plants (model data)

   Group	Average height
   plant food	15 cm
   plain water	11 cm

5. 4.

   Milo's cousin says, "My bean plants grew taller with plant food, so plant food helps plants everywhere." Which response is best?

   • Disagree: plant food made these bean plants grow shorter, not taller
   • Agree: one test shows it for plants everywhere
   • Agree: plant food is the same thing as water
   • Disagree: the test shows what happened to these bean plants
6. 5.

   "If ..., then ...". Investigation card: hypothesis, If ..., then .... Noah's friend says a hypothesis is just a guess, so any statement works. Which response is best?

   • Disagree: it is a testable prediction about two variables
   • Agree: any guess counts as a hypothesis
   • Agree: a hypothesis does not need testing
   • Disagree: a hypothesis must be shown to be true before testing
7. 6.

   What is changed, magnets in stack: 1, 2, 3; what is measured, blank. Ren tests whether stacking more magnets changes how many paper clips they pick up. What should Ren record?

   • The paper clips picked up on 1 trial
   • The color of each magnet
   • Magnets in the stack and clips picked up, for 3 trials
   • Clips picked up, with a different clip size for each stack
8. 7.

   Four blank table headers. Which results table fits Tala's plant-and-light test?

   • Plant name and favorite color
   • Light level and height, with a different soil in each row
   • Light level and the height of 1 plant
   • Light level, heights of 3 plants, average height
9. 8.

   Note: average of 3 trials. Sugar dissolved in 40 seconds on average in warm circle water and 95 seconds in cold. Which conclusion fits Zee's data?

   • Warm water dissolves anything faster
   • Sugar dissolved faster in the warm water in this test
   • Sugar dissolved faster in the cold water in this one test
   • Warm water is the nicer kind of water
10. 9.

    Note: average of 3 drops. Which conclusion fits Ari's bounce data?

    • The ball bounced back to its full drop height
    • Higher drops gave lower bounces
    • Higher drops gave higher bounces for this ball
    • Balls of any kind bounce higher from higher drops
11. 10.

    Note: 10 seeds per group. Bo's hypothesis: if seeds are soaked, they will sprout sooner. Ten seeds were in each group. What do the data say?

    • The data show soaked seeds grow into bigger plants
    • The data do not support it; dry seeds sprouted first
    • They support it: soaked seeds sprouted 2 days sooner
    • Seeds sprout because they wish to grow