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Investigation into Cress Seeds

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Introduction

Investigation into Cress Seeds PLAN Aim:coec ecr seececw orec eck inec foec ec; I will be investigating into the 'height' characteristic for each of the six cultivars of cress. I have chosen height because I want to choose a characteristic with continuous variation. A characteristic with discontinuous variation will not provide any readable results, therefore with a continuous variation characteristic, I can compare the differences in variation more easily. From this, I can also compare the selective breeding. Here is a diagram to explain what I mean by this: Heidegger obfuscated ronen's functionalism . SELECTIVE BREEDING E.g. height of carrots Height (mm)coee eer seeeeew oree eek inee foee ee. Selective breeding is the crop which is only allowed to breed. For example, Carrots wih highest lengths are required. To achieve this farmers have tried to overcome by this by controlling the two factors, which influence this characteristic, the environment and genes. A plant may have inherited genes for tallness HH, but has not got enough of the three main elements needed to grow, water, minerals and sunlight from its environment.cofd fdr sefdfdw orfd fdk infd fofd fd. Therefore, farmers first grow cress in ideal environments with sufficient light, water and minerals. Only the tallest crops are then selected to breed together. A new crop is grown. From that crop another batch and once again only the tallest crops are selected to grow. If we were to look at the graph and see the height with the highest number this would be the selective breeding crop. ...read more.

Middle

Safe Test: To ensure a safe test I must � Be careful NOT to drop the tray when taking it to the sink to be watered. � '' '' when cutting roots with the scalpel. OBTAINING EVIDENCE: RESULTS TABLE TYPE GERMINATION NO. HEIGHTS (mm) Lepidium 16 4, 5, 8, 8, 10, 10, 12, 12, 12, 13, 13, 13, 13, 15, 16, 19, Organic 22 + 1 15, 15, 20, 30, 34, 34, 35, 35, 36, 37, 37, 37, 38, 38, 38, 40, 40, 42, 45, 45, 46, 51 Thomson Morgan 22 + 1 20, 26, 29, 30, 34, 34, 35, 38, 38, 40, 41, 41, 43, 45, 45, 45, 46, 46, 47, 50, 51, 52 HurstCurled 19 5, 5, 8, 10, 10, 10, 10, 11, 11, 12, 15, 15, 16, 18, 19, 20, 23, 30, 30, Mr. Fothergills 23 16, 20, 23, 23, 24, 27, 30, 33, 33, 34, 35, 35, 37, 37, 37, 40, 40, 40, 40, 40, 40, 43, 45, Cress curled 25 20, 22, 22, 23, 23, 25, 25, 25, 25, 30, 32, 33, 33, 33, 33, 35, 38, 38, 38, 40, 40, 40, 40, 40, 41, * Numbers added on, are seeds that have germinated, but have not yet grown shoots. I have taken my results and placed them into a table for all six cultivars of cress. (See table). I have also used the results of others to show evidence of secondary data. This has helped me to make my results more accurate. ...read more.

Conclusion

Below are some reasons. Anomalies: Though my results were quite reliable, I still ended up with few anomalies. This could have been caused by the following reasons: � Positioning of tray - some cress seeds may not be receiving the same amount of sunlight as the others so the rate of photosynthesis would have varied. � Watering - We may have watered our cress at different times. N.B. For two days it was cloudy and therefore no watering was needed on those days. I did not water my cress but others may have. � Positioning of seeds - We may not have all equally placed our seeds so competition may have affected this. I have circled anomalies and noted what could have possibly caused this. Improvements: � I would take more care in preparation using the same size petri dishes and taking more care in placing the seeds. This would make the competition fair for each cultivar. � I would place them in a much more controlled environment. All of them would be placed in similar areas where the would receive the same sunlight. � I may use a larger data than just 25 seedlings per cultivar. Further Improvements � I could have carried out two lots of results if more equipment was available. This way I may not need to use other people's results. � I could have investigated into another factor, which I could have provided more scientific reasons for. E.g. 'would cress grow better in cotton wool or sugar paper'. we can say that whilst this represents a progression, in the end ...read more.

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