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The aim of this experiment is to investigate how plants fight infection from bacteria and fungus.

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The Anti Bacterial Properties of Plants Aim: The aim of this experiment is to investigate how plants fight infection from bacteria and fungus. Introduction: Plants are inanimate objects. Due to this plants are susceptible to infection from all kinds of different species of bacteria and fungus. Certain plants with antibacterial properties have the ability to inhibit or destroy the growth of certain bacteria. Garlic is the only antibiotic that can actually kill infecting bacteria and at the same time protect the body from the poisons that are causing the infection. Garlic is acknowledged to be as effective as penicillin. Even the blood of garlic eaters can kill bacteria and it is also reported that the vapour from freshly cut garlic can kill bacteria at a distance of 20 cms!! A common and apparently returning disease, tuberculosis was treated with garlic very successfully as the invading organism Mycobacterium tuberculosis is sensitive to several of the sulphur components found in garlic. Mint has been used for many centuries. ...read more.


Another plant will kill more bacteria within a radius than the garlic. Despite the fact that garlic does have some antibacterial properties it may not have the ability to kill all bacteria. Relationship to biological principles: This study can be related to biological principles because plants can run or hide so how would they protect themselves? To investigate we can study the antibacterial properties if they have any to see hoe effective this would be when confronted with the possibility of infection. Apparatus: * Agar plates seeded with bacteria * Plant material * Methylated sprit * Sterile pipette * Paper discs * Sterile Petri dish * Sterile forceps * Incubator Plan: Pre-prepared agar plates would be seeded with bacteria. 3g of the chosen plant would be crushed with 10 cm of Methylated sprit. This is used to kill any bacteria. The mixture would have to shaken regularly. ...read more.


For the same reason gloves would be used. Results: Plant Diameter of bacteria killed (mm) Garlic 10 Mint 3 Turmeric 4 Control 2 rosemary 3 thyme 4 It is difficult to distinguish anomalous results because there is little data of the same species to compare it with. To ensure that the data is reliable a micrometer was use to measure small distances. Also all substances were pipetted. Discussion: From my results I can reject my null hypotheses and accept my hypothesis that the garlic would kill more bacteria than the other plants. This can clearly be seen from the results. Therefore it can be concluded that garlic has more antibacterial properties other plants therefore theoretically making it less susceptible to disease. Mint is used by millions every day kill bacteria and plaques on their teeth. However although mint tastes nice, it is not as effective at killing bacteria as garlic is. Therefore garlic is better as toothpaste and also an anti bacterial agent. However there is a disadvantage which is the smell. ...read more.

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