Question

question 5 cindy conducts an experiment on diffusion using cells from the imaginary plant b. florensis. she notes that the cells are only made up of sugar and water and the cells contain a 5% sugar solution in them. however, the membranes are only permeable to water. she makes three solutions: pure water, 5% sugar solution and 10% sugar solution. in this experiment, she wishes to see if the solutions will change the mass of the cells in the plant. she places the cells in the solutions and after 20 minutes she makes individual slides of some of the cells from the three solutions, and she views them under a microscope. what is/are the standardized variable in this experiment? a the plant type b the mass of the plant over time c the solute concentrations of the three solutions d the amount of time the plant is submerged e both a and d

Explanation:

In an experiment to study diffusion in plant cells, the independent variable is what the experimenter changes. Here, the plant type is fixed (plant B. florensis), and we are testing different solute - concentration solutions. The mass of the plant over time and the amount of time the plant is submerged are dependent variables. The solute concentrations of the three solutions are the factor being manipulated, so it is the independent variable. Also, the time the plant is submerged can affect the results and is another factor that can be controlled and varied by the experimenter.

Answer:

E. Both A and D