Nobody downloaded yet

Photosynthesis: The Role of Light - Essay Example

Comments (0) Cite this document
Summary
“Photosynthesis: The Role of Light” Introduction Photosynthesis is the process by which autotrophs (capable of producing their own food) and a few bacterial species convert light energy into the chemical energy which is utilized by the entire animal kingdom either directly (by herbivores) or indirectly (by carnivores)…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER91.9% of users find it useful
Photosynthesis: The Role of Light
Read TextPreview

Extract of sample "Photosynthesis: The Role of Light"

Download file to see previous pages Morphology of the plant leaf The morphology of the leaf encompasses upper and lower epidermis- the outer later, possessing minute openings called the stomata through which gaseous exchange (CO2 is taken in and O2 is given out of the leaf), as well as elimination of water takes place through stomata (transpiration). Between these two layers is a layer of mesophyll cells they could be compact or spongy (filled with air) depending upon the plant adaptation to its habitat. Vascular bundle(s) are present inside the leaf. They have vascular tissues xylem (to carry water and minerals from the roots to the leaf) and phloem (to carry prepared food to the different plant parts and also to the storage parts such as fruits and stem or roots depending on the plant). The epidermis, both upper and lower do not contain chloroplast and therefore no photosynthesis takes place in these set of cells. They provide protection to the inner cells of the leaf (“Photosynthesis”). Structure of Chloroplast Mesophyll cells contain the organelle chloroplast, a typical characteristic feature of the plants, it contains outer membrane, inner membrane, stroma- the space, thylakoids- disc like structure, stacked one above the other to form a structure called grana (“Photosynthesis”). ...
Light Reaction B. Dark Reaction. A. Light Reaction- occurs in the presence of light and hence it is Light Dependent Reaction. During the process a molecule of chlorophyll in the thylakoids, absorbs a photon of light and eliminates an electron. Various other pigment molecules such as ?- carotene form a cluster and play an imperative role in absorbing a different color of light spectrum and pass the energy to the chlorophyll molecule (the elimination of hydrogen (H) atoms from the water molecule). The electron travels through the ETC (electron transport chain), during the process ATP (Adenosine triphosphate), an energy molecule is produced as well as NADP+ is reduced to NADPH. As a result of this reaction water molecule splits into H+ and O2 is released. The reaction is: 2H2O + 2 NADP+ + 3 ADP + 3 Pi + light > 2 NADPH + 2 H+ + 3 ATP + O2 (“Understanding The Role of Light in Photosynthesis”). Light Reaction Hydrogen molecule is made up of an electron (e-) as well as a proton (H+). With the help of light energy water molecule split as 2H2O > 4e- + 4H+ + O2. The released electron reduces NADP+ to NADPH to be used in Dark Reaction as well as it onsets an electrochemical charge to give energy for the proton pumping form stroma (the matrix of the chloroplast) to the thylakoid. These protons on one hand reduce NADP+ to NADPH and on the other hand they flow reverse from the thylakoid to stroma and during the process the energy given put is utilized by the ADP molecule to undergo the process of phosphorylation to form ATP, an energy rich molecule. Since the process of phosphorylation takes place in the presence of light it is ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Photosynthesis: The Role of Light Essay Example | Topics and Well Written Essays - 1000 words”, n.d.)
Retrieved from https://studentshare.org/biology/1449985-photosynthesis-the-role-of-light
(Photosynthesis: The Role of Light Essay Example | Topics and Well Written Essays - 1000 Words)
https://studentshare.org/biology/1449985-photosynthesis-the-role-of-light.
“Photosynthesis: The Role of Light Essay Example | Topics and Well Written Essays - 1000 Words”, n.d. https://studentshare.org/biology/1449985-photosynthesis-the-role-of-light.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document

CHECK THESE SAMPLES OF Photosynthesis: The Role of Light

The Effect Of Light Intensity On Photosynthesis Of Pondweed Plant

...?sCHOOL INVESTIGATING THE EFFECT OF LIGHT INTENSITY ON PHOTOSYNTHESIS OF PONDWEED PLANT WORK OF THE AIM: To Investigate the Effect of Light Intensity on Photosynthesis of Pondweed Plant RATIONALE AND RESEARCH To fulfill energy requirements of the body, living beings use food material. This food is either ingested, like animals do, or manufactured within their own body, such as in plants. Plants photosynthesize glucose for their energy expenditure. This glucose produced is either used instantly by the plants for growth, respiration and conduction processes, or it is stored in the form of proteins, starches, and oils. Almost 90% of plant products are synthesized by...
11 Pages(2750 words)Coursework

PHOTOSYNTHESIS

...for spectrophotometrically on a 620 nm wavelength by the change in absorbance of DCPIP as it accepts electrons by the conversion of water molecules in the chain. The rate of electron transport is a function of light intensity. Method Hill’s reaction was used to show how photosynthesis occurs in two distinct reactions. It also shows the role of light in photosynthesis which is shown by the difference in the readings of the spectrophotometer between tubes 3 and 4 where tube 3 is placed in the presence of light and tube 4 in the dark. Also boiling the solution destroys the chloroplasts in it, thus there is no observable change in...
4 Pages(1000 words)Essay

Report on photosynthesis lab

...of photosynthesis in plants is strongly influenced by three factors, namely, carbon dioxide concentration, light intensity and temperature (Blackman, 1905). A hundred years since, and after innumerable number of studies, the basic findings of Blackman has been so well recognized that the three variables are often referred to as the "limiting factors" for photosynthesis in plants. Crop physiologists, agronomists, ecologists, crop modelers and a score of others interested in plants have endlessly toyed with these variables in their pursuits to understand plant responses to extreme climatic conditions to, in their efforts to design and breed plants with higher productivity. Obviously the...
8 Pages(2000 words)Lab Report

Photosynthesis

...remove grease stains faster. Thus in both cases, that is, photosynthesis and cleaning stains, temperature play a crucial role in determining the efficiency of the processes. Reference: 1. Smith, A. L. (1997). Oxford dictionary of biochemistry and molecular biology. Oxford [Oxfordshire]: Oxford University Press. pp. 508. ISBN 0-19-854768-4. "Photosynthesis - the synthesis by organisms of organic chemical compounds, esp. carbohydrates, from carbon dioxide using energy obtained from light rather than the oxidation of chemical compounds."  2. Nealson KH, Conrad PG (December 1999). "Life: past, present and future". Philos. Trans. R. Soc. Lond., B, Biol. Sci. 354 (1392):...
2 Pages(500 words)Lab Report

The Impact of Light Wavelength to Photosynthesis

...The Impact of Light Wavelength to Photosynthesis This study aims to examine the effect of wavelength of light received to photosynthesis. In our experiment seven plants were placed in the CID machine and tested for CO2 level decrease. Each plant was tested for 5 minutes. Initial measurement taken 2 minutes into test and final reading was taken at 7 minutes. With the assumption that the rate of photosynthesis as manifested by CO2 consumption would be inversely related to the received light wavelength, drops in CO2 recorded and data calculated. Green wavelength having the lowest rate of photosynthesis was the only data...
6 Pages(1500 words)Lab Report

Photosynthesis

...Photosynthesis Photosynthesis is the process that occurs in the chloroplasts residing in mesophyll cells through which plants take in the light energy from the sun and convert it to chemical energy. This happens by taking 6 water molecules and 6 carbon dioxide molecules and releasing 1 sugar molecule and 6 oxygen molecules (Starr, Taggart, Evers, & Starr, 2009). 6H2O + 6CO2 ----------> C6H12O6+ 6O2 Chloroplasts are made up of thylakoid membranes where the green pigment chlorophyll is found. Chlorophyll looks green because it absorbs the red and blue wavelength of the visible light spectrum, reflecting back the green. The molecule is made up of a porphyrin ring with...
2 Pages(500 words)Essay

Photosynthesis

...Effects of Green and Blue Light on the Rate of Photosynthesis Photosynthesis is defined as a process by which green plants, cyanobacteria and algae make their own food. This process begins when the green plants, cyanobacteria and algae convert energy from sun into chemical bond energy of organic molecules such as sugars. During photosynthesis, light energy will be used to synthesize water and carbon dioxide to produce glucose and oxygen (Lena, 2010). Complex reaction of photosynthesis that takes place in the leaves can be summarized as follows: Sunlight and chloroplasts 6CO2 + 6H2O 6O2 + C6H12O6 Carbon ...
4 Pages(1000 words)Lab Report

Photosynthesis

...Yoo Jin Choi Biology 1108 2/4/14 Photosynthesis Lab assignment Introduction Photosynthesis is a process by which light energy is converted into chemical energy. It involves uptake of carbon (IV) oxide and release of oxygen. Being an enzymatic process, there are other factors that regulates it. There is a relationship that exists between photosynthesis and respiration in regard to the exchange of the respiratory gases i.e. oxygen and carbon (IV) oxide (Berg 71). In this experiment, Light as a necessity of photosynthesis is the variable under investigation. According to the research design in this experiment, leaf disks float rate would be...
2 Pages(500 words)Lab Report

Respiration and Photosynthesis

...Respiration and Photosynthesis Respiration and photosynthesis are complement to each other; while photosynthesis utilises light energy, carbon IV oxide and water to produce glucose and oxygen, respiration uses the produced oxygen to break down glucose into carbon IV oxide and water. In the environment, green plants by the process of photosynthesis release carbon IV oxide which is taken up by other living organisms for respiration which in turn release oxygen required for photosynthesis (Photosynthesis vs. Respiration 2012). Respiration and photosynthesis are similar in the production of energy rich...
3 Pages(750 words)Essay

Photosynthesis

...Photosynthesis Photosynthesis relates to the process through which green plants and other specific organisms use sunlight in synthesizing carbohydrates from water and carbon dioxide. The process occurs in three imperative stages including harnessing sunlight energy, synthesizing NADPH and ATP using energy harnessed, with the last step being Calvin cycle involving CO2 fixation. Calvin cycle as the last step uses ATP, CO2, NADPH, and ribulose 1, 5-biphosphate to synthesize glyceraldehydes 3-phosphate used in production of sugar and starch through glycolysis (Hurd et. 179). The overall process of photosynthesis occurs through the chemical reaction outlined as. 6CO2 + 6H2O +...
1 Pages(250 words)Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Let us find you another Essay on topic Photosynthesis: The Role of Light for FREE!

Contact Us