WorksheetsScientific method TEST adapted
Total questions: 18
Worksheet time: 2hrs 7mins
A teacher asked her students to perform an experiment on factors that affect the rotting of apples. Sadie obtained
three Honey crisp variety of apples. One she kept at room temperature, 25° C. Another she refrigerated at 15°
C, and the third she kept at 5° C. She checked the apples every day. Examine her results in the table below, and
answer the questions that follow.
Temperature Time to Rot
25° C 4 day
15° C 8 days
5° C 12 days
1. The independent variable in this experiment was the
temperature at which the apples were kept
variety of apple
the amount of time before the apples rotted
The dependent variable in this experiment was the
temperature at which the apples were kept
variety of apple
the amount of time before the apples rotted
Based on her experiment, Sadie should predict that at 20° C, the apple should rot in about (a) days.
Noah decided to compare the rotting times of three different varieties of apples. He left several Gala apples at 25°C, several Granny Smith apples at 15° C, and several Red Delicious apples at 5° C. All apples were ripe and had just been picked from the plants, and all were fresh when the experiment began. Here are his results:
Variety Temperature Time to rot
Gala 25° C 5 days
Granny smith 15° C 9 days
Red delicious 5° C 17 days
The major mistake that Noah made in his experiment was that he
had too many independent variables
had no experimental group
used too many different varieties of apples
Which conclusion could Noah reasonably draw from his experiment?
Granny Smith apples rot faster than Red Delicious
Granny Smith apples rot faster than Red Delicious
He couldn't conclude either of these
Hailee performed a similar experiment by checking all three varieties of apples at the same temperature. When she did this, at 25° C, she got the following results:
Brands Time to rot
Gala 12 days
Granny Smith 9 days
Red delicious 15 days
All three varieties of apples had just been picked from the tree and were fresh before the experiment began. Hailee concluded that she should always buy Gala apples. Other students, however, repeated her experiment and found that, on the average, there was no difference among the three varieties.
What was wrong with Hailee’s conclusion?
She should have tried several different temperatures.
She should have repeated the experiment several times to see if she always got the same results.
25° C is too warm to store apples.
Maggie Mae designed an experiment to find out which antibiotic was most effective against some bacteria. She cut out four different circles from a paper towel and soaked each circle in a different antibiotic. She put the circles on a nutrient agar-coated Petri dish (a dish used to grow bacteria) that was covered with bacteria commonly found on the human body. She then allowed the bacteria to grow and reproduce for 24 hours. What should Maggie Mae do to improve her experiment?
(a)
A scientist plants two rows of pumpkins for experimentation. She puts a fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the growth of the pumpkins over the course of 5 months.
What is a constant in this experiment?
(a)
What hypothesis is the scientist testing?
If pumpkins are given more sunlight, then they will grow better.
If pumpkins are given more water, then they will grow better.
If pumpkins are treated with fertilizer, then they will grow better.
Which sentence best states the importance of using control groups?
Control groups allow you to compare the results between groups receiving a treatment and those receiving no treatment.
Control groups eliminate the need to repeat the experiment to verify the results.
Control groups provide a method keeping all the variables exactly the same.
8. A scientific study showed that distance at which bats will approach buildings varied from day to day. On cloudy nights, the bats were found 2 meters from building. On non-cloudy nights, the bats were found 8 meters from the building. Which hypothesis best explains these observations?
If there is greater light intensity, then the further bats stay away from buildings.
If there is less people, then the further bats stay away from buildings
If there is a greater light intensity, then the closer bats get to buildings.
A student decides to set up an experiment to see if students perform better in school if school starts later.
Write your own hypothesis for this experiment.
If students are allowed to start school later (a) ,
then---------------------------------------------
because (a) .
What is the independent variable?
(a)
Who/what is the control group?
(a)
Who/what is the experimental group?
(a)
What needs to be kept identically the same in this experiment? Please list at least three.
(a)
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