Osmosis Internal Assessment - Biology Higher Level

3984 Words16 Pages
| The effect of salinity on osmosis of solanum tuberosum L.(potatoes) | Biology HL Internal Assessment – Year 10 | | Teresa Nguyen | | Table of Contents 1 DESIGN 2 1.1 Defining the problem 2 FOCUS QUESTION 2 HYPOTHESIS 2 BACKGROUND INFORMATION 2 INVESTIGATION VARIABLES 3 1.2 Controlling Variables 3 TREATMENT OF THE CONTROLLED VARIABLES 3 CONTROL EXPERIMENT 4 1.3 Experimental Method 4 MATERIALS 4 RISK ASSESSMENT 5 METHOD 5 2 DATA COLLECTION and PROCESSING 7 2.1 Recording Raw data 7 QUANTITATIVE RAW DATA 7 QUALITATIVE RAW DATA 7 2.2 Processing Raw Data 8 Processed Data Table 9 3 Conclusions and Evaluation 11 3.1 Conclusion 11 CONCLUSION STATEMENT 11 CONCLUSION EXPLANATION 11 3.2 Evaluation Procedures 12…show more content…
| The size of potato slices. | All potato pieces used were cut to a size of 2 cm in length. | The duration of the investigation. | All the trials were conducted in the same time duration of 24 hours. | Source of biological material. | All sources (potatoes) were purchased from the same producer. | The size of the test tubes. | All trials used the same sized large test tubes. | CONTROL EXPERIMENT The control of this investigation is the potato pieces placed in distilled water over 24 hours. By being left in distilled water allows the no contamination of the unknown substances or sodium chloride to affect the osmosis process within the potato cells. According to theory, the potato slices in distilled water should increase in mass as the osmosis process would allow water to move through the semipermeable membrane of the potato cells. This control variable will allow the comparison of the masses of the potato pieces in sodium chloride. Thus, revealing the effects of saline substances in plant osmosis. 1.3 Experimental Method MATERIALS TABLE 3: List of apparatus Apparatus Required | Quantity Required | solanum tuberosum L. (Potatoes) | 1 Bud | Cork Borer | 1 | Fat Test tubes | 30 | Sodium Chloride solution (2%, 5%, 10%, 20% and 25% ) | 200cm3 (25cm3 per test tube) | Marker | 1 | Paper towel roll | 1 | Distilled Water | 200cm3 (25cm3 per test tube) | Ruler (30cm) | 1 | Electronic Scales (±Distilled Water(0.00)1g) | 1 | Weigh

More about Osmosis Internal Assessment - Biology Higher Level

Open Document