Biology Coursework On Beetroot

Biology Coursework On Beetroot-83
The volume of liquid may have been a source of error.The volume of water in the beaker which is acting as a water bath does not have to be a specific volume.There will also be the same number of disks per boiling tube, 3 disks, to increase the surface area. Middle - Record results for each test in the results table. Clean apparatus and repeat the experiment changing the temperature to all specified temperatures - just above 0o C, 20o C, 40o C, 60o C or 80o C - and making sure the same volumes, equipment and method is used.

The volume of liquid may have been a source of error.The volume of water in the beaker which is acting as a water bath does not have to be a specific volume.There will also be the same number of disks per boiling tube, 3 disks, to increase the surface area. Middle - Record results for each test in the results table. Clean apparatus and repeat the experiment changing the temperature to all specified temperatures - just above 0o C, 20o C, 40o C, 60o C or 80o C - and making sure the same volumes, equipment and method is used.

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Graph 2 shows results for temperatures 10o C, 20o C, 30o C, 40o C, 50o C and 60o C.

The new results for 10o C (84%, 82%, 87%) are much more compliant and have a very small variation, making the average figure 84.3%.

This makes me come to the conclusion that the results are inaccurate and the experiment should be retaken.

The readings for 60o C (3%, 2%, 2%) were extremely low.

Dependant Variable: The amount of red pigment in the water will be measured as a light transmission percentage by a colorimeter.

Controlled Variables: Beetroot surface area: The surface area of the beetroot disks has to be the same to make it a fair test, all the beetroot disks have to be the same dimensions throughout the experiment.

However, it is important that the volume of water within the boiling tube is constant throughout.

This was easily achieved by using a small 10cm3 measuring cylinder.

This possible error did not affect my results as my accuracy was to 0.1cm3.

A nearly 100% accurate measurement can be achieved if a precision pipette is used. This is a piece of electronic equipment that may malfunction, as possibly happened with the initial result for 10o C.

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