5. Conclusion


Our hypothesis is false, where we had assumed that because the plastic bottle will nurture more bacteria, it’s growth rate will also be the fastest. However, our assumption was wrong and the metal bottle actually had the fastest bacteria growth.

Whereas, our results are valid, having conducted the experiments and fulfilled the requirements of the variables before cultivation of bacteria.

Areas for improvement

However, there will always be possible sources of errors, such as the wrong amount of water drank, or bacteria entering the agar plates before we spread the water samples, or having inconsistent hours in incubation.

Based on our results, there might also be other types of material out there, as the experiment only had the top 3 most-used types of water bottles for testing. More types of water bottles could be used for testing as the procedure will still be the same.

Our data collection instruments were the use of markers to help with counting of the number of colonies, thus it was possible for us to miss out a few colonies, making our results less accurate.

The methods were edited to fit what resources we have, so they were not as satisfactory. Day two of testing had to be incubated for two days in total, so our results might also be inaccurate.

Practical Applications

The information concluded from this experiment will let people realise the amount of bacteria in the bottles, so that they can choose the proper bottles and know that they should wash the bottles properly. We can advise people to use metal bottles more, instead of plastic bottles which has suitable conditions for bacterial growth.

Areas for further study

There could be more research on the different types of bacteria and how it affects humans. Individually, it is possible to have more understanding and experience in proper handling of equipment.

Comparisons with previous research

From the previous research which was about Minimising Bacteria In the Thawing and Cooking of Meat, we changed the procedures and objectives of the experiment. Instead, we chose to find out the which material of the bottle (eg. plastic, metal, recyclable) allows the most growth of bacteria within the shortest period of time.   

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