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Plant Lab. What effect does the amount of light have on the growth of a bean plant measured by the height of the bean plant?

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Design your own lab By Kaushik Surisetty per.5 Problem: What effect does the amount of light have on the growth of a bean plant measured by the height of the bean plant? Background and Hypothesis: Photosynthesis forms the basis for this experiment. This is the process by which a plant makes food for itself in the form of glucose from the raw materials around it. The energy needed for photosynthesis comes from sunlight, which is the variable for this experiment. The substance that absorbs sunlight is chlorophyll, which is mainly contained in chloroplasts. The energy from the sun is used to split water molecules which is the process photolysis, this through the use off photo systems pump protons in to the lumen of the chloroplast creating a concentration gradient. When protons moved through CFOCF1 complexes to the stroma which has a lower concentration of hydrogen, this creates ATP. This energy is used to convert carbon dioxide (CO2) and water into sugars. This conversion creates the waste product oxygen and the sugar glucose that the plants uses to nether store in food reserves or uses to grow through cellular respiration. The cells of the plant use the glucose to grow roots, cells and stem which results in an increase of height. Without being able to photosynthesize, plants will stop growing and die since there is no form of useable energy for its cells. ...read more.


This increases the amount of light the plant receives and its chances to produce more glucose. 3. Create a closed box is meant to limit the light entering the box. Do this by placing a large black screen in front of the box. To make this screen put a black cloth over the opening. This will limit the light but still let some through so life. 4. Leave the last box alone as it will be our control. 5. For each box poke holes for gas exchange. 6. Make sure to place a collection tray to gather excess water from under the plant. 7. Place these boxes and the plants in the same location which control humidity, temperature and amount of gases available. 8. Make sure pots have holes through the bottom for excess water. Here is a diagram for the set up of this lab: Procedure: 1. Germinate seeds by soaking beans in water overnight, and then placing them in a wet paper towel for half a day. 2. Fill pot with soil and place seed on top of soil and place a light 0.2 cm layer over top. Don't not push Bean into the soil. 3. Let all pots grow and sprout. Some will not sprout. Only 3 plants are needed 4. ...read more.


The sprouting time may have been different depending on seed and its size. The temperature may have been influenced by the high light conditions which would have made a huge difference. Any of these areas could have disrupted the results and mostly likely if there was a contained system that was closely monitored, then there would had been a valid result. The black screen may have influenced the temperature with in the box. The seeds sprouted during different times in the day but for did to be controlled w would have to grow many seeds and take out a average group with this. The results do show that the excessive light did have an impact on plant growth by to be sure it wasn't' the actually behavior or status of the seed it self can't really be controlled. The prediction was partially falsified as the high light growing plant grew close to 10% shown by the 4cm increase but there was a 66% increase when compared to the plant grown in the dark. This is partially because of the underestimation of how low amounts of light effect plants and partially because of the underestimation of the apparatus used. Reference: * Botany Basics. In http://extension.oregonstate.edu/mg/botany/index.html. Retrieved September 7, 2008 from http://extension.oregonstate.edu/mg/botany/photo.html * Biology Coursework by Duncan Garnett Experiment 1-"Comparing the Growth of Plants Grown in the Light and in the Dark." 123HelpMe.com. 07 Sep 2008 <http://www.123HelpMe.com/view.asp?id=147949>. * What is Photosynthesis? Retrieved September 7, 2008 http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPS.html ?? ?? ?? ?? ...read more.

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