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Factors That Germination Influence

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Introduction

James Fruen The Effect Of Sodium Chloride Concentration In Growing Medium On the Growth And Total Germination Of Cress Seeds Scenario There are a number of things that can influence how/if a plant grows and germinate. These include; * Amount and intensity of sunlight. * CO2 concentration of the air. * Temperature and humidity of the atmosphere. * PH of the water and soil. * Salt concentration of the soil and water. * Quality of the soil, i.e. Minerals and nutrients. * Use of fertilisers and pesticides. The dependant variable (DV) in this scenario is the germination and growth rate of the seeds. The factors that effected the growth and germination of the seeds where therefore the independent variables (IV). Introduction Germination is triggered by the uptake of water into the seed, water always moves from a place of higher water potential to a place of lower water potential. Water potential is a measure of the tendency of water to move from high free energy to lower free energy. Distilled water in an open beaker has a water potential of 0 (zero), the highest water potential possible. The addition of solute decreases water potential. ...read more.

Middle

Repeat this process for sequential test tubes so each is half the concentration of the previous test tube. 7. Discard the 15cm3 taken from test tube 5 Method Continued... 4. Create an experimental control by labelling a test tube '6' and placing 15cm3 of distilled water in it. 5. Mark the 6 trays with the concentration range (ie. 2.0 - 0.0) 6. Put the relevant solution into the cotton wool lined trays 7. Place the 20 seeds in each tray, remembering to leave 2cm gap between the seeds on each side. 8. Cover the trays with the clingfilm and leave on a windowsill 9. Take the measurements at the set times 10. Repeat the experiment 5 times 11. If the cotton wool dries out, the same amount of water should be added to each tray Sample Tables Mean No. Of Seeds Germinated After (Days) Concentration (%) Repeat 2 4 6 8 10 12 14 2 1 2 3 4 5 6 1 1 2 3 4 5 6 0.5 1 2 3 4 5 6 0.25 1 2 3 4 5 6 0.125 1 2 3 4 5 6 0 1 2 3 4 5 6 Length Of Radicle (cm) ...read more.

Conclusion

The third source of error could have been in collecting repeat data from other students in the class. Each student has a slightly different way of carrying out the measurements of the radical etc. However, this problem is also minor and will have minimal affect on the results. In contrast, a major problem is the time intervals between measuring the radical lengths. There where to few results collected to make an accurate statement about the growth rate or germination, only a general pattern can be made from the results gathered in this experiment, as there are only 3 different intervals for measuring the growth. To make the experiment more accurate, measurements need to be taken at much more closer intervals (eg every few hours for the first few days) then daily after that. The results produced from an experiment with that sort of structure, would yield much more conclusive results as to rate of growth. Finally, again to do with the serial dilution technique used, solutions should have been prepared up from 0.1% to 1.0% in increments of 0.1%. This again would yield a much more accurate representation of each concentration being used, and maybe smooth out overall trends in the results. ?? ?? ?? ?? ...read more.

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