Question

1. which group served as the control group in this experiment?

a) group a - natural daylight only
b) group b - low - intensity light for 8 hours
c) group c - medium - intensity light for 12 hours
d) group d - high - intensity light for 16 hours

1. how many variables should be changed in an experiment?

a) one
b) two
c) three
d) as many changes as possible

1. which of the following statements best represents a good hypothesis?

a) plants exposed to a greater amount of light will have the greatest amount of growth.
b) increasing light intensity will improve plant growth.
c) if plants are grown in different amounts of sunlight then the plant with the greatest amount of light will grow the most compared to the other plants in lower lumens.
d) plants are the independent variable.

1. as many as possiblebased on the data table, what scientific claim can be most accurately made?

a) light exposure has no effect on plant growth.
b) plant height increases as the amount of light exposure increases.
c) plants grow best at natural light.
d) light intensity randomly impacts plant growth.
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Explanation:

1. The control group in an experiment is the one that does not receive the experimental treatment. Here, natural daylight - only group is the baseline.
2. In a well - designed experiment, only one variable should be changed to accurately determine its effect.
3. A good hypothesis is an if - then statement that is testable. Option C is in the correct format and is testable.
4. Based on typical plant - light relationships, more light exposure usually leads to more growth, assuming other factors are constant.

Answer:

1. A. Group A - Natural daylight only
2. A. One
3. C. If plants are grown in different amounts of sunlight then the plant with the greatest amount of light will grow the most compared to the other plants in lower lumens.
4. B. Plant height increases as the amount of light exposure increases