Photosynthesis EssayMatt Lazar5/13/968th Hr.
When you and me eat, we find our food. When plants eat, they make theirown food and energy. They make their food and energy through a process calledphotosynthesis. Through photosynthesis oxygen is also produced. Photosynthesisis “a process in which green plants synthesize carbohydrates from carbon dioxideand water.
. . . The reverse of this reaction provides energy for plants, foranimals that eat plants, for animals that eat animals that eat plants” foranimals that eat animals that eat animals that eat plants, etc. (Levine 726)All humans rely on these plants to produce oxygen from photosynthesis.Order now
Thepresence of light and of the green pigment chlorophyll makes the change ofcarbon dioxide and water to glucose and oxygen possible. It was Jan Ingenhouzwith Jean Senebier in Geneva that founded the basic gist of the theory ofphotosynthesis in plants. My experiment involves testing different brands of plant food on plantsto see what brand of plant food makes the plant grow the tallest. I will testthree types of plant food on three sets of plants and one set with no food.
Iwill water the plants all the same amount and let all the plants get the sameamount of sun, then measure the height of all the plants at the end of six weeksand record the data. The first step of photosynthesis is the absorption of light by achlorophyll molecule. “The energy of the absorbed photon is transferred fromone chlorophyll molecule to another until it reaches a site called a reactioncenter. . . .
One oxygen molecule is produced per eight photons absorbed. ” (Alberty708) James Huheey, professor at the University of Maryland, talks aboutchlorophyll in his book Inorganic Chemistry: “Chlorophyll absorbs low-energylight in the far red region. . . . Such absorption serves a twofold function: (1)Theenergy may be passed along to the chlorophyll system and used in photosynthesis;(2)It protects the biological system from photochemical damage.
” (629)”Chlorophyll a and chlorophyll b contain networks of alternating single anddouble bands, and have strong absorption bands in the visible part of thespectrum. . . .
,” says Robert Alberty, who is a professor of chemistry at theMassachusetts Institute of Technology. (708)Photosynthesis, “. . . which occurs entirely in the chloroplasts of greencells, involves a number of steps catalyzed by enzymes. The chloroplastscontain chlorophyll a, chlorophyll b, carotenes, electron carriers, and enzymes,and have internal membranes that keep reactants separated,” says Alberty.
(708)James Huheey talks about some “features of the chlorophyll system whichenhances its usefulness as a pigment in photosynthesis: “First, there is anextensive conjugation of the porphyrin ring. This lowers the energy of theelectronic transitions and shifts the absorption maximum into the region ofvisible light. Conjugation also helps make the ring rigid and thus less energyis wasted in internal thermal degration. ” (631) “In order for phosphorescenceto occur there must be an excited state with a finite lifetime. If such anexcited state is available then there is time for a chemical reaction to takeplace to take advantage of the energy prior to phosphorescence.
. . . The presenceof a metal atom is necessary in order that phosphorescence takes place. ” (Huheey631)”Chlorophyll contains a conjugated ring system that allows it to absorbvisible radiation.
. . . ” (Levine 726) In Inorganic Chemistry, James Huheeyreports about ring system: “The chlorophyll ring system is a porphyrin in whicha double bond in one of the pyrrole rings has been reduced. A fusedcyclopentanone is also present. .
. . In addition, other pigments such ascarotenoids are present which absorb higher energy light. ” (629) The exactfrequency of the light that is absorbed by the chlorophyll depends upon thenature of the substituents on the chlorophyll. Photosynthesis is a crucial process that is necessary for the human raceand other races that breath the oxygen that the plants produce to live. Photosynthesis is a complex process that we know only broad details about.
Chlorophyll and light are what is needed for plant to photosynthesize. I thinkthat my experiment will prove the best brand of plant food out of the three. The best brand would be the one that makes the plant grow highest. So considerjust how important that green plants really are to the human race and theirsurvival on the earth. Works CitedAlberty, Robert A.
Physical Chemistry. New York: Wiley, 1983. Asimov, Isaac. Photosynthesis. New York: Basic, 1968.
Brock, William H. The Norton History of Chemistry. New York: 1993. Huheey, James E. Inorganic Chemistry. New York: Harper, 1972.
Levine, Ira N. Physical Chemistry. New York: McGraw, 1978.Science .