||We know that plants use water like humans use blood. It circulates the vitamins and minerals throughout the plant. We also know that salt and water bond, which is why freshwater can turn into saltwater. Finally, we know that water in a piece of celery diffuses into the saltwater solution, and it begins to shrivel because of that lack of water.
||We want to test how much bend we can achieve on a piece of celery after placing it into a salt solution. We want to know how much more it will shrivel from a 0% concentration to a 15% concentration, and a 15% concentration to a 30%.
||We predicted that if we add more salt the cup the celery will be able to bend much more. We think this because the cup with 10 grams of salt was able to bend much more than the cup with 5 grams of salt. We think that if we use our 30% and 15% solutions the celery will bend more drastically.
||To start our experiment, we will find a piece of celery that is straight and healthy. Then, we will cut the celery into three pieces, 10cm in length and approximately equal widths. After that, we will cut the celery length-wise into thirds, resulting in 9 equal pieces of celery. We then record the weight, length, and width before the experiment. Next, we will take 3 cups of 200ml of water and make 2 of the cups salt solutions. The solutions will be 15% and 30% salt solutions in hopes that we will see a more drastic change in the celery. One of the cups will have no salt and will our control. To start the experiment, you will place a third from each of the three pieces of celery and place them into the solutions, and wait 24 hours. After the 24 hours, we will record the changes of the celery and find the averages of the cups. We are planning to test the amount of bending that we see in the celery and the consistency of the celery. We will try and keep the amount of water and the conditions of the celery during the experiment the same. We will record all of the data in our scientific notebooks for further review.
||From our experiment we learned that the higher the concentration of salt, the more malleable and shriveled the celery will become. In our 30% solution the celery sticks were much lighter and shorter than they were originally. This is because the salt caused the cells to shrivel. However the salt itself didn't make the celery sticks bend. We could bend them ourselves, but the control solution with no salt bent the most of the celery sticks. We believe this is because the cells tried to expand but the plant's fibers didn't have room for growth, so it just began to bend. Next time we wish to let the celery sticks sit in the solution for longer. We believe our results would've been more obvious if we had. In conclusion, celery sticks when placed in a salt solution become shriveled and malleable, giving them the ability to be bent easily. When placed in tap water they attempt to expand and end up with curvature while also being very stiff.
||High School Students (Grades 9,10,11,12)
||Anna-Jonesboro High School