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Investigating the effects of plant density on growth rate

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________________ TABLE OF CONTENTS page number 1. DESIGN 1 1.1 Defining the problem 2, 3 1. Focus / research question 2. Hypothesis 3. Background information / theory 4. Investigation Variables 1.2 Controlling Variables 3, 4 1. Treatment of Controlled Variables 2. Control Experiment 1.3 Experimental Method 4- 7 1. Materials 2. Risk Assessment 3. Method 2 DATA COLLECTION and PROCESSING 8-12 2.1 Recording Raw Data 1. Quantitative Data 2. Qualitative Data 1. Processing Raw Data 1. Statistical Processing - calculations 1. Presenting Processed Data 1. Result (s) table (s) 2. Graph (s) 3 CONCLUSION and EVALUATION 12-13 3.1 Conclusion 1. Conclusion statement 2. Conclusion explanation 3.2 Evaluation Procedures 1. Reliability 2. Limitations / Weaknesses / errors in Laboratory Investigation 3. Significance of weaknesses on experimental results 1. Improving the Investigation 1. Modifications to experiment BIBLIOGRAPHY 14 APPENDIX A Risk Assessment and Laboratory Order Form 1. Design ? Part A ________________ 1.1 Defining the Problem Focus / Research Question How does plant density affect the growth of radish seeds? Hypothesis If the population of plants in soil increases then the growth of the radish seeds will be reduced. Background Information / Theory Germination is the first stage of plant growth, resulting in a seedling. Seeds need soil, heat, oxygen and water to germinate. Initially the food required for the seed to germinate is stored in the seed (Wikipedia 2012, Factors Affecting Seed Germination). ...read more.


Use 5 plant pots for the control, label them CA, CB, CC, CD, CE (C for Control) and place it next to E 2. Place 500cm³ beaker on the electronic scale and press tare button to bring the weight down to 0.00g 3. Measure out 500g in beaker, adjusting when needed and insert the soil into a plant pot 4. Repeat steps 4 – 5 for all plant pots 5. Line a pencil up with a ruler and mark the pencil at 2cm from the bottom 6. Using the previously marked pencil, skewer 2 holes to the mark into every plant pot labeled 1, in the row of plant pots labeled A, B, C, D and E 7. Using the previously marked pencil, skewer 4 holes to the mark into every plant pot labeled 2, in the row of plant pots labeled A, B, C, D and E 8. Using the previously marked pencil, skewer 8 holes to the mark into every plant pot labeled 3, in the row of plant pots labeled A, B, C, D and E 9. Using the previously marked pencil, skewer 12 holes to the mark into every plant pot labeled 4, in the row of plant pots labeled A, B, C, D and E 10. Using the previously marked pencil, skewer 16 holes to the mark into every plant pot labeled 5, in the row of plant pots labeled A, B, C, D and E 11. ...read more.


For each type of sample tested, five trials were conducted, thus enabling the investigation to gain further accurate results. As seen in Table 5 of the initial results these repeat measurements for each sample type do support each other. Most uncertainties within this investigation were not large enough to have a significant effect on the results. The graphical representation of the final results (Graph 1) matches the predicted hypothesis significantly. Through statistical analysis the standard deviations for the results were calculated. None of the standard deviations within the results exceeded 1 unit, thus proving this test to have high precision and accurate results. Limitations / Weaknesses / Errors in Laboratory Investigations As the investigation was quite thoroughly controlled, few limitations were observed. However, although the temperature was controlled, it may have been beneficial to grow the plants in a further controlled environment such as a laboratory. Human error may also have contributed to the small lack of precision within the results. Through the excessive control applied to the experiment, small amounts of ecological validity may have been lost during the investigation. Significance of weaknesses on experimental results Through the identification and alteration of these limiting factors this investigation may gain more accuracy. 3.3 Improving the Investigation Modifications to experiment Few modifications to the experiment may be made to enable further accuracy within the results. The limiting factors mentioned in 3.3 could be altered or modified, thus producing more accuracy. ...read more.

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