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Monitor cress and see if different water types affect their growth.

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Biology Coursework Aim: To monitor cress and see if different water types affect their growth. Prediction: I predict that the mineral water will help the cress grow best because all the best minerals are still in the water and haven't been filtered out. Most of the waters have gone through some kind of process and when they do this some of the minerals and removed from the water e.g. things are removed from sparkling water and distilled water so you can drink it but the things are good for plants. Apparatus: 15 x cress seeds 5 types of water Measuring cylinder Planting pots Ruler Soil Method: First, I will get all the 15 cress seeds and put them each in a separate planting pot with some soil. I will make sure to use the same amount of soil with each seed as the soil contains nutrients as well as the water. ...read more.


I will also make sure that there is always the same volume (50ml) of water for each seed. I will perform this experiment three times as to make sure of no special seeds and to make an average. I will measure the cress in mm every day. This way there will be the same amount of time between measurements. This experiment will be performed over a period of 11 days. Results (in mm) Distilled Water Salt Water Mineral Water Sparkling Water Tap Water Day 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Day 2 0 0 0 0 0 0 1 1 2 2 2 3 3 3 4 Day 3 1 0.75 1 0 0 0 7 7 7 6 5 6 9 7 8 Day 4 2.5 2 2.5 0 0 0 14 13 14 13 14 15 17 17 19 Day 5 4 3.5 ...read more.


This shows me that the minerals are not just provided from the water but also from the soil otherwise I assume that the mineral water would have grown the best cress as it has "the best nutrients". Evaluation If I was to do this experiment again to get better results there are two things I would change. Firstly, I would have taken results over about a month to give the seeds a real chance to grow and so there may have been a bigger range of growth to compare the water types in. If there were a greater time to grow, maybe another water type would have shown the greater results instead of tap water. Secondly, I would have used more types of water as one of them may combine all the good things from each type of water to make really good water to grow cress in. Steven Titterton Biology GCSE Coursework Dr Wareham ...read more.

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