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Strength of Celery

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Practical Write up Title: Extraction of fibre's from celery Aim: To investigate whether a change in weight upon a fibre of celery will affect the extension and whether it breaks. Hypothesis: I predict that an increase in weight will have an impact on the strength of the fibre. This is due to the greater force being applied to the fibre and it not being able to withstand the weight. Null hypothesis: An increase in weight will not have an impact on the extension or the breaking of the fibre. Method: Firstly, taking a stick of celery, separate a single fibre from the plant. Then, using a venires calibre (a piece of equipment that allows for small measurements) measure the diameter of the fibre. This piece of equipment allows for accuracy and makes the results more reliable. Next, using a ruler, measure the length, making sure each fibre is 8cm long in order for the test to be fair. ...read more.


weights applied Dependant variable: The extension and or breaking of the celery fibre Controlled variables: The height in which the celery is hung from. The length of the fibre There are certain variables that can't be controlled in this experiment. Which will be taken in to account in the conclusion. Results: Length Diameter Weight applied before breaking Extension Try 1. 8cm 1mm 240g 4.9cm Try 2. 8cm 0.5mm 300g 6cm Try 3. 8cm 0.9mm 300g 6.5cm Try 4. 8cm 0.6mm 80g 1.6cm Try 5. 8cm 0.5mm 40g 1.2cm Try 6. 8cm 0.5mm 120g 3cm Try 7. 8cm 1mm 80g 1.7cm Mean 166g 4.5cm Conclusion: The trend and patterns of my results show that the increase in weight is in positive correlation to the extension of the fibre and resultantly it breaking. These results are significant because they show the strength of xylem vessels and how important this factor is to the plant in transporting water. ...read more.


This fibre is unlikely to be the same diameter of the original fibre, and if it is greater then it is likely to hold more weights. The condition of the fibre is hard to control and this is another contributing factor that may take away from the accuracy of the experiment. Sources of error in my experiment were found in tying the fibre to the clasp. Tying the fibre proved difficult, as it often fell off. It also couldn't be controlled as to how much of the fibre was used in the knot, as if the length of it was shorter, it allows less 'give' for the extension. This could have been improved by clipping it or using something to stick it to the clasp. There were also limitations in the experiment. These were found in how many times we could repeat the experiment due to material and time restraints. This limitates the conclusion of results, as the more times that the experiment could have been carried out, then the more accurate the results are. ...read more.

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