acid rain can have a ph between 1.5 and 5.0. the effect of acid rain on the environment depends on the ph of the rain and the characteristics of the environment. it appears that acid rain has a negative effect on plants. the scale below shows the ph of normal rain.
normal
rain
1 2 3 4 5 6 7 8 9 10 11 12 13 14
ph scale
provide the information requested below that should be included in a research plan to test the effect of ph on the early growth of bean plants in the laboratory.
6. state a hypothesis.
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7. identify the independent variable.
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state two factors that should be kept constant.
(8) _________________________________________________
(9) _________________________________________________
10. construct a data table to organize the results.

Question

Accepted Answer

### Question 6: State a hypothesis.
# Brief Explanations:
A hypothesis is a testable prediction. Since the experiment tests the effect of pH on early growth of bean plants, we can predict the relationship. Based on the context of acid rain (low pH) having negative effects, we can hypothesize that as the pH of the water (or solution) used to water bean plants decreases (becomes more acidic), the early growth (e.g., height, number of leaves, biomass) of bean plants will decrease. Or a more specific hypothesis: Bean plants watered with solutions of lower pH (more acidic) will exhibit slower early growth (e.g., less increase in height over a week) compared to those watered with neutral or higher pH solutions.
# Answer:
If bean plants are watered with solutions of decreasing pH (becoming more acidic), then their early growth (e.g., height, number of leaves) will decrease, because acid rain (low pH) is known to have negative effects on plants. (A more concise version: Lower pH of watering solution will reduce early growth of bean plants.)

### Question 7: Identify the independent variable.
# Brief Explanations:
The independent variable is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable. In this experiment, we are testing the effect of pH on bean plant growth, so the pH of the watering solution (or the pH of the environment for the plants, like the soil pH influenced by watering) is the variable we will change.
# Answer:
The independent variable is the pH of the solution (or environment) used to water the bean plants (e.g., the pH of the watering solution).

### Question 8 and 9: State two factors that should be kept constant.
# Brief Explanations:
Controlled variables are factors that could affect the outcome (dependent variable) but are kept the same to ensure a fair test. For bean plant growth, factors like the amount of water (volume) given to each plant, the type of soil (same soil composition, nutrient content), the amount of light (same intensity and duration), the temperature of the growth environment, the type of bean plant (same species, same age/seed size), etc., should be constant. We choose two:
# Answer:
(8) The amount of water (volume) given to each bean plant (e.g., 50 mL per plant per day).
(9) The type and quality of soil (e.g., same brand and type of potting soil for all plants).

### Question 10: Construct a data table to organize the results.
# Brief Explanations:
A data table for this experiment should include the independent variable (pH) and the dependent variable (a measure of early growth, like plant height, number of leaves, biomass). We can have columns for pH value, initial growth measurement (e.g., initial height), final growth measurement (e.g., final height), and growth (final - initial) or other relevant metrics. Rows can represent different trials or different pH levels tested.
# Answer:
| pH of Watering Solution | Initial Plant Height (cm) | Final Plant Height (cm) | Growth in Height (cm) | Number of Leaves (Initial) | Number of Leaves (Final) | Change in Number of Leaves |
|-------------------------|---------------------------|-------------------------|-----------------------|----------------------------|--------------------------|----------------------------|
| 3.0                     |                           |                         |                       |                            |                          |                            |
| 5.0                     |                           |                         |                       |                            |                          |                            |
| 7.0 (Control, neutral)  |                           |                         |                       |                            |                          |                            |
| 9.0                     |                           |                         |                       |                            |                          |                            |

*(Note: The table can be adjusted based on the specific growth metric chosen, e.g., if using biomass, a column for biomass can be added. Also, rows for different pH levels (including a control at pH 7, and acidic/basic levels) and columns for initial, final, and change in growth parameters are included to track the effect of pH over time.)*

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Question

Explanation:

Question 6: State a hypothesis.

Answer:

Question 7: Identify the independent variable.