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Effect of acid rain on germination of cress seeds

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Effect of acid rain on germination of cress seeds Aim: to investigate that how the acid rain affects the germination of cress seeds. The factors that effect the germination of seeds are: * Temperature * Acid rain * Oxygen * Water I will just see what effect does the acid rain have on germination of seeds. Apparatus: * Petri dish (11) * Cress seeds (20 11) * Sulphuric acid (70cm�) * Distilled water * Measuring Syringes (11) * Beakers * Filter paper (11) * Specimen tube (11) * Pipette Diagram: Method: 1. I collected all the apparatus needed (see apparatus list). 2. I made a dilution series (see dilution series). 3. Placed the filter paper in the bottom of the petri dish. 4. Took 10cm� of diluted acid from dilution of 0.010 and labelled it 0.010. I repeated this with every single dilution and petri dish. But wash the syringe with water so there is no acid in the specimen tube. 5. Picked 20 cress seeds for each petri dish and placed in each petri dish. 6. Took 3cm� distilled water in the pipette and putted it onto the seeds. ...read more.


The effect does the acid is has on the very tiny and very specialised part, the embryo, where cells are already formed and where most of the initial merits cells are. These merits cells are the ones that do all the dividing. If cell division does not happen, the plant does not grow and eventually it will die. The acidity is has an effect on those cells. Membranes keep cells separate from each other; these membranes keep areas isolated from each other so that reactions in one area don't interfere with reactions in another. Water and some other things such as hydrogen pass freely though the membranes, but most things are only let in through expenditures of energy or as a result of a pH gradient. The hydrogen's in an acid (like sulphuric) disrupt the pH gradient. The cell must work overtime to deal with the additional hydrogens and processes such as photosynthesis and respiration are disrupted, which at first slows growth and may eventually result cell death. Once the hydrogens are gone from the sulphuric acid, the sulphate that is left will bind with minerals and nutrients in the seed and remove them from use by the plant. ...read more.


Percentage germination (%) 0.01 25 0.009 50 0.008 75 0.007 85 0.006 95 0.005 85 0.004 85 0.003 95 0.002 95 0.001 100 0 (distilled water) 90 Conclusion & analysis: my prediction was right that stronger the concentration acid the smaller the length of germination. I can see that by looking at my graphs of total length of germination graph and average length of germination at different concentrations of acid, at 0 concentration (distilled water) the length of concentration of germination is the longest. My other prediction was that stronger the concentration of acid the fever seeds will germinate was also right. In my percentage germination graph I can see that stronger the concentration of acid the fever seeds germinated. Evaluation: I can see that I had less seeds germination at water than at the concentration of 0.001, this could had been due to the quality of seeds I used. If I have a chance again to this experiment I will use good quality of seeds and make sure they are not damage. I would also like to use different types of seeds and acid, which will help me to see the connection between the acids and seeds. I would also like to see how the temperature, water and oxygen will effect the germination of seeds. ...read more.

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