What if you were designing an experiment testing the impact of different pH levels on plant growth. What would be the levels of your independent variable and you would need to vary the pH of a factor that plants need for growth such as soil, fertilizer, or water. What would be your dependent variable; that is, what result would you measure?
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What if you were designing an experiment testing the impact of different pH levels on plant growth. What would be the levels of your independent variable and you would need to vary the pH of a factor that plants need for growth such as soil, fertilizer, or water. What would be your dependent variable; that is, what result would you measure?
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- Some seeds (tomato, for example) had been germinated and the seedling grew for 2 weeks in soil, where the soil water potential was maintained at -0.2 bars. The plants were then divided into 5 groups and each group subjected to a different soil water potential as follows: Group 1: 0 bars Group 2: -0.03 bars Group 3: -0.2 bars Group 4: -3.0 bars Group 5: -5.0 bars At the end of three weeks at these various soil water potentials, the plants that would have made the least growth would be expected in which group? Question 11 options: Group 3 Group 1 Group 2 Group 4 Group 5Imagine an experiment where I am testing the effects of salt on the growth of corn plants. I set up several treatments where some plants get no salt, some are watered with a 0.05% salt solution, and some are watered with a 0.1% salt solution. I use the same species of plants, the same soil, and the same total amounts of water in my experiment. Every other day I record the height of the plants in cm. What is the independent variable in my experiment? What is the dependent variable in my experiment? What is the control treatment in my experiment? What are three controlled variables in my experiment?You are an amateur gardener and are reading an article that explains that plants need only five basic factors for growth: sunlight, water, air, nutrients, and a substrate on which to grow (soil). You want to investigate the role that these variables play in plant growth. You decide to test the substrate and see if changing substrate mixes will affect plant growth. Match the following experimental components with their descriptions. Experimental Components: ( Experimental Variable, Dependent Variable, Control Condition, Independent Variabe, A Confounding Variable That Must Be Held Constant) 1. type of substrate used: 2. growth resulting from substrate type 3. amount of water needed in all plants 4. substrate that is changed during the experiment 5. substrate that is not changed during the experiment
- 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. Provide the information requestec 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. Which of the following would be the dependent variable? (choose all that apply)kr Normal rain 12 3 45 6 7 89 10111213 14 pH Scale a. the pH of the rain b. the type of plant c. the amount of rain d. the height of the plant Se Which statement best describes the growth curve seen below: a. It shows only exponential growth b. It shows a decline in population c. It shows growth slowing and then remaining steady d. It shows extinctionMalathion is an organophosphate pesticide that is used often in residential and commercial landscaping. A landscaping company came and applied the pesticide to a lawn and after a couple of days. An environmental science student sampled the soil and analyzed the pesticide content. The student found the soil concentration of malathion to be 6.26 ppm. Assume a soil organic content of 1.5%, a soil particle density of 2.0 mg/L, and a soil porosity of 45%. If it rains the next day and water mixes well with the soil, estimate the concentration of malathion in the soil water.43. Two soil samples, A & B, at same soil moisture levels are placed in contact with each other. Water will more likely move from soil B to soil A if their osmotic potentials, expressed in kPa, are: O A=-30; B=-70 O A=-10; B=+10 O A=-60; B=-10 O A=-50; B=-100 OA=-20%; B=-20
- Observation: I want to know what effect salt has on the growth of grass. So I measure out 3 equal-sized squares of grass out the back of the Green Building. The first square of lawn I water with 5 liters of pure water from a watering can every day. The second square of lawn I water with 5 liters of pure water with 2 grams of salt mixed in, every day. The third square of lawn I water with 5 liters of pure water with 4 grams of salt mixed in, every day. I measure the height of the grass after 14 days and note the following observations. The first square is green and 15 cm high. The second square is greeny-yellow and 6 cm high. The third square is yellowy-brown and looks dead and is only 2cm high. What could we infer about the effect salt has on the growth of grass?A scientist is studying the effect a new fertilizer has on root growth on bean seedlings. Three groups of plants are grown in the same location in a greenhouse, each receiving the same amount of sunlight and water every day. The scientist measures the length of the roots for each plant every day. The scientist then calculates the mean for each group for five days. The results are shown in the following table. Fertilizer Experiment Data Table Which are the controlled variables in this experiment? Select all that apply. A B Day 1 Day 2 Day 3 Day 4 Day 5 с D Group 1 0 mg 3.0 cm 3.2 cm 3.4 cm 3.7 cm 4.2 cm the number of days the experiment lasted the amount of fertilizer each plant was given the location the plants were grown in the type of fertilizer used by the scientist Group 2 5 mg 2.7 cm 3.1 cm 3.7 cm 4.2 cm 4.6 cm Group 3 10 mg 2.9 cm 3.3 cm 3.7 cm 3.9 cm 4.1 cmExperiments usually have several controlled variables. These are variables that must be kept constant in all parts of an experiment. For example, if an experiment is testing the effect of sunlight on the growth rate of 5 seeds, the only variable that should change should be the amount of sunlight. All other variables should remain the same to ensure that sunlight is the only aspect affecting the results. The other variables, such as soil type, amount of water, type/amount of fertilizer, are the controlled variables. Looking back at the simulation experiment on the meteorite, describe two variables that should have been controlled.
- Imagine you were testing how the presence/absence of soil bacteria affected plant growth. In this experiment you had two treatments - one with soil bacteria present, the other with soil bacteria absent. To determine how soil bacteria affected plant growth, you then measured plant height after 1 month. You find that plants grow taller in the treatment with soil bacteria compared to the treatment with no soil bacteria. Which graph or graphs would be most appropriate for portraying the results from your experiment? SELECT ALL THAT APPLY. Scatter plot Pie chart Bar graph Box plot Line graphSoil organic matter (SOM) samples have charge that is pH-dependent, and measurements for the cation-exchange capacities (CECS) of soil organic matter average around 150 cmol(+)/kg SOM at neutral pH. Meanwhile, smectite clay minerals have CECS that average approximately 100 cmol(+)/kg clay. Since these two phases are the dominant contributors to soil CEC, we can use SOM content and smectite content (if we can measure it) to estimate total soil CEC. What would be your estimate for the total CEC (in cmol(+)/kg soil, to the nearest 0.1 cmol(+)/kg soil) of a soil that contained 3.28 % SOM and 1.0 % smectite clay by weight?You are interested in determining the amount of fertilizer your lavender plants need to increase their growth. You get 5 pots of plain soil. You transplant one lavender plant into each pot and measure the height of the plant. You label each pot with letters A-E. A does not get any fertilizer, pot B gets 2mg of fertilizer, pot B gets 4 mg of fertilizer, pot C gets 6 mg of fertilizer, pot D gets 8 mg of fertilizer, and pot E gets 10 mg of fertilizer. For one month you water the plants the same amount and each plant receives the same amount of light. After one month you measure the plants again. The results of the experiment are below. A. Write a testable hypothesis for this experiment. B. Write a prediction based on your hypothesis. C. What is the dependent variable? D. What is the independent variable? E. Do the results support or refute your hypothesis? Results Pot Initial Measurement (cm) Final Measurement (cm) A 5.2…