Question

1. what was the variable in his experiment?

a. covering both jars.
b. covering one jar and leaving the other uncovered.
c. leaving both jars uncovered.
d. there was no variable in this experiment.

1. what do you think redis conclusion was?

a. living things come from other living things.
b. living things are created through spontaneous generation.
c. he did not have enough data to arrive at a conclusion.
can you spot the scientific method?
each sentence below describes a step of the scientific method. match each sentence with a step of the scientific listed below.

1. stephen predicted that seeds would start to grow faster if an electric current traveled through the soil in which they were planted.
2. susan said, \if i fertilize my geranium plants, they will blossom.\
3. jonathans data showed that household cockroaches moved away from raw cucumber slices.
4. rene grew bacteria from the mouth on special plates in the laboratory. she placed drops of different mouthwashes on bacteria on each plate.
5. kathy used a survey to determine how many of her classmates were left - handed and how many were right - handed.
6. jose saw bats catching insects after dark. he asked, \how do bats find the insects in the dark?\
7. justin wondered if dyes could be taken out of plant leaves, flowers, and stems.
8. alice soaked six different kinds of seeds in water for 24 hours. then she planted the seeds in soil at a depth of 1 cm. she used the same amount of water, light, and heat for each kind of seed.
9. bob read about growing plants in water. he wanted to know how plants could grow without soil.
10. kevin said, \if i grow five seedlings in red light, i think the plants will grow faster than the five plants grown in white light.\
11. angelas experiment proved that earthworms move away from light.
12. scott said, \if acid rain affects plants in a particular lake, it might affect small animals, such as crayfish, that live in the same water.\
13. michael fed different diets to three groups of guinea pigs. his experiment showed that guinea pigs need vitamin c and protein in their diets.
14. kims experiment showed that chicken eggshells were stronger when she gave the hen feed, to which extra calcium had been added.

a. recognize a problem
b. form a hypothesis
c. test the hypothesis with experiment
d. draw conclusions
a. recognize a problem
b. form a hypothesis
c. test the hypothesis with experiment
d. draw conclusions

Explanation:

• Question 5: In an experiment, the variable is the factor that is changed. Covering one jar and leaving the other uncovered creates a difference, which is the variable.
• Question 6: Redi's experiment disproved spontaneous generation and showed that living things come from other living things.
• Question 7 - 20: Recognizing a problem is asking a question about an observation. Forming a hypothesis is making a prediction. Testing the hypothesis with an experiment involves doing a test to see if the prediction is correct. Drawing conclusions is stating what the results mean.

Answer:

• 5. B. Covering one jar and leaving the other uncovered.
• 6. A. Living things come from other living things.
• 7. B. Form a hypothesis
• 8. B. Form a hypothesis
• 9. D. Draw conclusions
• 10. C. Test the hypothesis with experiment
• 11. C. Test the hypothesis with experiment
• 12. A. Recognize a problem
• 13. A. Recognize a problem
• 14. C. Test the hypothesis with experiment
• 15. A. Recognize a problem
• 16. B. Form a hypothesis
• 17. D. Draw conclusions
• 18. B. Form a hypothesis
• 19. D. Draw conclusions
• 20. D. Draw conclusions