Essay on 2.03 Cell Membranes and Homeostasis

878 Words Mar 31st, 2014 4 Pages
Title: Ms. K
Cell Membrane and Homeostasis Experiment
Objective(s): The reason for this experiment is to see how starch and iodine affect each other and how a plastic bag works similar to a membrane in certain situations.
Introduction: I know prior to doing this experiment that iodine mixed with starch creates a dark color and that most objects, organic and inorganic, naturally experience isotonic reactions.
Hypothesis: I think that the potato will absorb more starch than the sweet potato and they will both absorb relatively similar amounts of water.
Procedure: Variables: Controlled- water and size of potatoes. Manipulated variables- potatoes growth based on contents of solution.
Data and Observations
Bag Content Initial
…show more content…
This is through active transport because it uses energy.
Part 2
1. Restate your hypothesis and discuss if the observed results supported the hypothesis.
- Based off what I observed, my hypothesis, stating that the potato will absorb more starch than the sweet potato, was correct.
2. Use your observations to explain if each type of cell (potato, sweet potato/pear/apple) was isotonic, hypertonic, or hypotonic to each of the solutions. Explain what happened to each type of cell in response to the type of solution it was in.
- Potato- it was hypertonic and gained water in the water solution. In the starch solution, it was hypotonic.
- Sweet Potato- it was hypertonic in the water solution and went through plasmolysis in the starch solution.
3. Based on the observed volume changes, which of the vegetables/fruits used in this experiment has a greater amount of sucrose in its cells? Explain your answer.
- The Sweet Potato seemed to have an originally larger amount of sucrose in its cells.
Conclusion: In conclusion, it seems like the hypothesis was relatively correct. From the data collected from the experiment, the two potato samples were subjected to different solutions. The potato was hypertonic to the distilled water and hypotonic to the starch solution. The sweet potato, on the other hand, was a little harder to determine, though it was obvious that it was hypertonic to the distilled water, it was hard to determine if it was hypo-,hyper-,

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