A student designed an experiment using 125 radish seeds and five petri dishes. Each petri dish was lined with a filter paper disk and poured with 5 mL of water. She placed 25 seeds in each petri dish and recorded the results after four days. She was able to gather the following data:
Dish Number Temperature
(oC) Light Intensity Number of Seeds Sprouted
1 0 1 500 0
2 15 1 500 11
3 30 1 500 23
4 45 1 500 9
5 60 1 500 0
6. Based on the results given, what temperature resulted in the greatest number of sprouted seeds?
a. 15oC c. 45oC
b. 30oC d. 60oC
7. What is the constant variable in the experiment?
a. dish number c. number of seeds sprouted
b. light intensity d. temperature
Dish Number Temperature
(oC) Light Intensity Number of Seeds Sprouted
1 0 1 500 0
2 15 1 500 11
3 30 1 500 23
4 45 1 500 9
5 60 1 500 0
6. Based on the results given, what temperature resulted in the greatest number of sprouted seeds?
a. 15oC c. 45oC
b. 30oC d. 60oC
7. What is the constant variable in the experiment?
a. dish number c. number of seeds sprouted
b. light intensity d. temperature
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Scientific Investigation
6. b. 30°C
7. b. light intensity
Explanation:
In conducting a scientific investigation, it starts by defining the problem or question to be answered. From this question, background information will be gathered so that one can formulate a tentative answer to the question. This tentative answer to the question is known as the hypothesis. To test the hypothesis, one conducts an experiment. The experiment will show the relationship of the independent and dependent variables while all other variables are held constant. The independent variable is what the researcher manipulates or changes and it is the cause of the change in the dependent variable. The dependent variable is the effect of the change of the independent variable. This is what is being measured or the data being gathered in the experiment. Other variables are made the same in order to have a valid experiment. Data will then be gathered and analyzed in order to come up with a conclusion. A conclusion is an answer to the question or problem. Then results should be communicated.
In the question, the independent variable is the temperature, the dependent variable is thenumber of seeds sprouted. Other variables such as light intensity, number of days, soil are made constant. In the experiment conducted, we get to see the effect of different temperatures on the number of seeds sprouted.
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