Investigating the Effects of Salts on Onion Cell Structure

Investigate the impact of various salts on onion cell structure through a well-documented experiment. Assess strengths and weaknesses in theory, experiment setup, results, and conclusion.

• Onion Cells
• Salt Effects
• Cell Structure
• Experiment Analysis
• Scientific Investigation

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1. Topic 12: Onion Cells Opponent: Anna Arsenou

2. Task Investigate the effects of various salts on the structure of onion cells. 1

3. Theory Strengths Weaknesses Explained theory of osmosis/plasmolysis Didn t link to experiment? Explained concave vs convex plasmolysis Didn t mention colligative property of osmosis-vie Visual aid Variables are not clear - control variables, independent, dependent 2

4. Experiment Strengths Weaknesses Used moles to measure the salt concentration Used same onion but different skins Used 9 different salt solutions 3

5. Set up Strengths Weaknesses Stated what solutions she used No photos of her set up present No materials - tool list present 4

6. Results Strengths Weaknesses References results to the hypothesis No tables or raw data evident Units and graphs are evident No evidence of standard deviation(for 20 trials) Incorrect graphs, for the data collected scatter graphs should be used Labels cannot be understood 5

7. Conclusion Strengths Weaknesses Hypotheses in conclusions No suggested improvements Future suggestions included 6

8. Thank you