Photosynthesis Essay is the process by which chlorophyll – containing organisms – suchas green plants, algae, and some bacteria – capture energy from light andconvert it to chemical energy. For the process of photosynthesis to take placethe organism must contain chloroplasts. Chlorophyll is responsible for the greencolor in plants and is also responsible for their ability to photosynthesize. Photosynthesis is usually carried out in the leaves of green plants, but it canalso take place in other parts of the plant such as the stem.
The balancedchemical equation for photosynthesis is: Sunlight + 6CO2 + H2O –yields-C6H12O6+ 6O2 The purpose of this lab is to answer the question, “Is sunlightrequired for photosynthesis?” III. ) Experimental Design / Materials andMethods The first experiment was called “Separating Plant Pigments. “In this first experiment the materials that you need are a piece of green plant(collard greens), a piece of chromatography paper, solvent, and a test tube. Thefirst thing you do is take your green plant and fold it up tightly. Second, youlay the plant on the chromatography paper and smash parts of the plant onto thepaper. Next you mark the outside of the tube with a wax pencil where the bottomof the pigments are.Order now
Then we take the paper back out of the tube and add thesolvent to the bottom of the test tube. Next we have to wait fifteen to twentyminutes for the see what will happen to the paper. The purpose of thisexperiment is to see how many different pigments will separate from the greenplants. The second experiment was called “Detecting Carbon DioxideAbsorption in Green Plants.
” In the second experiment that was conductedthe materials needed are three large test tubes, some Elodea plants, bromthymolblue solution, and a piece of tin foil. The first thing you do is place piecesof the Elodea plant in two of the test tubes. Second you add the bromthymol bluesolution, which is a carbon dioxide indicator, to the test tube nearly to thetop. The third tube is filled with bromthymol blue solution and is used as acontrol so that you can compare color change. Next you wrap one of the Elodeacontaining tubes in tin foil so that it does not receive sunlight. The otherElodea containing tube should be placed in the light.
All should remain this wayfor a twenty-four hour period. The purpose of this experiment is to detect whencarbon dioxide is released or gained. The third experiment is called”Detecting Starch in Leaves. ” Starch is not a result ofphotosynthesis, but we think that it came from sugars produced duringphotosynthesis. The materials needed for this experiment are a hot plate, twosmall beakers, water, ethanol, a leaf from a Coleus plant exposed to light; alight deprived plant, and an iodine solution.
The first thing you do is boilingthe light exposed leaf in water for one minute. Next you boil the same leaf inethanol for one minute or until the leaf has turned white. Take the leaf out ofthe ethanol and place it on a small petri dish and soak it in the iodinesolution. If the plant contains starch the color of the iodine will change froma rusty red color to a dark purple or black. Next you take the light deprivedplant and boil it for one minute in water.
Take it out of the water and place itin the ethanol solution and boil it for one minute. Take the leaf out of theethanol and place it on a small petri dish and cover it in iodine. The purposeif this experiment is to detect starch in green plants. IV. ) Results In thefirst lab that was conducted our results came out positive that light isrequired for photosynthesis to occur. In this experiment I had three colorpigments to separate out on to the chromatography paper.
Photosynthesis waspresent in these because the pigments contained chlorophyll a, which plays animportant part in photosynthesis. The other pigments contained carotene andxanthrophylls, which are both present in photosynthesis. In the secondexperiment we used Elodea plants and a carbon dioxide detecting solvent to seewhen carbon dioxide is released or gained. In the first tube with the Elodeawrapped in tin foil, so that it could not receive light, the plant gained carbondioxide during aerobic cellular respiration and turned the solvent yellow.
Inthe control tube the .