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

   • Plant the soaked seed in a sunnier spot
   • Soak the 1 seed for longer
   • Soak 10 seeds, keep 10 dry, and plant all alike
   • 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?

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

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: the test shows what happened to these bean plants
   • 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
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?

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

   Four plan cards beside a ball and a meter stick. Pia wants to know whether drop height changes bounce height. Which plan is best?

   • Drop from 3 heights onto 3 different floors
   • Drop 3 different balls from one height
   • Drop the ball once from each height
   • Drop the same ball from 3 heights, 3 times each, same floor
8. 7.

   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
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?

   • Sugar dissolved faster in the cold water in this one test
   • Warm water dissolves anything faster
   • Sugar dissolved faster in the warm water in this 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 higher bounces for this ball
    • Balls of any kind bounce higher from higher drops
    • Higher drops gave lower bounces
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
    • They support it: soaked seeds sprouted 2 days sooner
    • Seeds sprout because they wish to grow
    • The data do not support it; dry seeds sprouted first