Essays Tagged: "light energy"

Investigation on how light intensity affects the rate of Photosynthesis.

Introduction: Photosynthesis is the process by which green plants use the light energy to convert carbon dioxide and water into simple sugar called glucose, which provides a ... orophyll, consisting largely of carbon and hydrogen. It gives green color and absorbs the necessary light for photosynthesis. Chloroplasts are found in palisade cells, they have a large surface area, ... ts are found in palisade cells, they have a large surface area, which means there is more change of light hitting a chloroplast. Light is a very important factor when it comes to the process of photos ...

(3 pages) 75 1 3.4 Nov/2003

Subjects: Science Essays > Biology > Plant Biology

Biology: The Light Dependent Reaction

In the Light Dependent phase of photosynthesis, light strikes Photosystem II, causing the electron to becom ... wn the ETC, the electronloses energy. The energy released is used to produce ATP. At the same time, light is hitting Photosystem I, which makes it's electron's excited. The electrons are passed to ano ... The hydrogen + ions that resulted from photolysis are also picked up by the NADP+, making NADPH.The light dependent reaction takes place in the thylakoid membrane.-Reactants:Light EnergyChlorophyllADP ...

(1 pages) 31 0 1.8 Apr/2004

Subjects: Science Essays > Biology

Photovoltaic Cells.

Photovoltaic cells convert light energy into electricity at the atomic level. Although first discovered in 1839, the process of ... iscovered in 1839, the process of producing electric current in a solid material with the aid of sunlight wasn't truly understood for more than a hundred years. Throughout the second half of the 20th ... nents in a complete system.The conversion efficiency of a PV cell is defined as the ratio of the sunlight energy that hits the cell divided by the electrical energy that is produced by the cell. This ...

(2 pages) 19 0 3.0 Sep/2005

Subjects: Science Essays > Physics

Quantum Physics: What do we really know?

d that energy is quantitized. Later Einstein created the photoelectric effect where he claimed that light energy came from something called photons. These ideas were considered the Old Quantum Physics ...

(1 pages) 45 1 1.5 Sep/2005

Subjects: Science Essays > Physics

Rate of Photosynthesis.

BACKGROUND:Photosynthesis is the process in which light energy is converted to the chemical energy of sugars. It can be summarised in the following eq ... n be summarised in the following equation.Cardon dioxide + Water in the presence of chlorophyll and light produces Glucose + OxygenThis process occurs in the chloroplasts of plant cells which are prim ... g a low pressure they will sink because they become less dense than the solution.In the presence of light the cells in the leaf photosynthesise to produce oxygen which makes them more buoyant until ev ...

(5 pages) 52 0 0.0 Oct/2005

Subjects: Science Essays > Biology > Plant Biology

What is meant by bottom-up and top-down processing in sense and perception?

ch is the conversion of stimulus energy into neural impulses. The stimulus energy is in the form of light energy (waves), and this light energy enters the eye. After passing through such parts as the ... nd this light energy enters the eye. After passing through such parts as the iris and the lens, the light energy reaches the retina, where sense receptors are located and where transduction occurs. Ro ...

(2 pages) 15497 1 4.0 Feb/2006

Subjects: Social Science Essays > Psychology > Sensation & Perception

Investigating the factors that affect the rate of photosynthesis of submerged cotyledon (seed leaf) discs

en from water. Hexose sugars and starch are commonly formed so the following equation is often used:light energy6CO2 + 6H2O C6H12O6 + 6O2carbon dioxide water chlorophyll carbohydrate oxygenPhotosynthe ... n dioxide water chlorophyll carbohydrate oxygenPhotosynthesis consists of two stages: These are the light-dependent reactions, for which light energy is necessary, and the light independent reactionss ...

(15 pages) 25 0 0.0 Mar/2006

Subjects: Science Essays > Biology

Why are bacteria so diverse metabolically? What are some of the things they are capable of and why?

btain carbon and energy from the environment. Photoautotrophs are photosynthetic organisms that use light energy to synthesize organic compounds from carbon dioxide. Chemoautotrophs obtain energy by o ... by oxidizing inorganic substances and need carbon dioxide as a carbon source. Photoheterotrophs use light for energy but must obtain their carbon in organic from. Chemoheterotrphs must consume organic ...

(2 pages) 22 0 4.0 Jun/2006

Subjects: Science Essays > Biology

Photosynthesis in Plants

Aim: To investigate the effect of different light intensities on the rate of photosynthesis (conventional method)Introduction: Photosynthesis is ... food. There are a few conditions required for photosynthesis to take place. They are: Chlorophyll, Light, Carbon Dioxide and Water. Each of these factors has a different effect on the rate of photosy ... on the rate of photosynthesis. In plants, the chlorophyll present in the chloroplasts, converts the light energy from the sun and converts it into chemical energy. It also traps the sun's light energy ...

(4 pages) 59 0 3.5 Sep/2006

Subjects: Science Essays > Biology > Plant Biology

Renewable Energy (Solar and Hydro) Research Assignment

or just enough hydroelectricity to power a small community. Solar energy depends upon the heat and light energy of the sun and is used to do more than just create electricity. Hydroelectric energy is ... ent Greeks used sundials to tell time, all the way to the more advanced uses of solar energy today. Light energy from the sun is used to power most satellites. This is especially efficient because it ...

(10 pages) 143 0 3.0 Mar/2007

Subjects: Science Essays > Environmental Science

Comparison & Contrast between Photosynthesis and Cellular Respiration

low in living things. Photosynthesis is a process by which plants and some other organisms convert, light energy from the sun, CO2 from the air & H2O from the earth, into chemical energy stored in ... their products and reactants are the exact opposite.Photosynthesis can be divided into two stages: Light Reaction & Calvin Cycle. The process of photosynthesis begins when excited its electrons g ...

(4 pages) 91 0 0.0 Nov/2007

Subjects: Science Essays > Biology > Plant Biology

The Sun

3;. In the 1880’s, selenium photovoltaic cells were developed that could convert light into electricity with 1-2% efficiency (“the efficiency of a solar cell is t ... 2% efficiency (“the efficiency of a solar cell is the percentage of available sunlight converted by the photovoltaic cell into electricity�). The production of e ...

(13 pages) 34 0 3.0 Feb/2008

Subjects: Science Essays > Chemistry

Color blindness

es are hereditary and present at birth. The retina, is a complex nerve system which converts light energy into electrical energy that is then transmitted to the brain. This conversion is accomp ... ing the color. Each cone contains visual pigments that are sensitive to one of three wavelengths of light: red, green and blue. Normally, all colors of the spectrum are able to be matched by mixtures ...

(3 pages) 13 0 0.0 Feb/2008

Subjects: Humanities Essays > Health & Medicine > Diseases


Photosynthesis is the conversion of light energy to chemical energy. I occurs in two stages. These are the light reactions and the dark ... o chemical energy. I occurs in two stages. These are the light reactions and the dark reactions.The light reaction takes place in the thylakoids. In the light reaction, light energy strikes antennae p ... on gradient that drives the synthesis of ATP from ADP. ATP is formed by a chemiosmotic process. The light energy absorbed in the pigments of photosystem 1 and passed to P700 result in the boosting of ...

(2 pages) 21 0 0.0 Feb/2008

Subjects: Science Essays > Chemistry

Review of two experiment the first on the reaction between a gummy bear and molten potassium and the second is Oxidation of glycerine by potassium permanganate

water and potassium chloride. This reaction is exothermic, releasing energy in the form of heat and light (we can see flame a bright light during the experiment). The energy released is also equal to ... eaction shows the conversion of a form of energy to different forms such as thermal/heat energy and light energy. The potassium is acting like an enzyme in the reaction. It is basically like cellular ...

(2 pages) 4677 0 0.0 May/2008

Subjects: Science Essays > Chemistry

Lab report for chromatography,international baccalaureate programme

ns:One of the requirements for the photosynthesis process to occur, the plant cells need sufficient light. Pigments are the substances that absorbed visible light. Different pigments absorb light of d ... different wavelengths.From the absorption spectrum of chlorophyll a, it suggests that blue and red light work best for photosynthesis.There is a high degree correlation between the absorption spectra ...

(2 pages) 15 0 0.0 Nov/2008

Subjects: Science Essays > Biology

Lab 4: Plant Pigments and Photosynthesis

esis, in a nutshell, is process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis ... lace (similar to the power house cell, the mitochondria, in an animal cell). Not all wavelengths of light are absorbed during photosynthesis. Green, the color of most plants, is actually the color tha ...

(9 pages) 41 0 5.0 Nov/2008

Subjects: Science Essays > Biology

Plant Photosynthesis Lab

esis.Water抯 Role in PhotosynthesisIn the process of photosynthesis, green plants use radiant light energy to combine water absorbed through the roots, and carbon dioxide from the air, to form o ... glucose. Glucose is a simple sugar (nutrient) produced, which is used by the plants to grow.Radiant light energy is obtained during the daytime from the Sun. Carbon dioxide from the atmosphere enters ...

(7 pages) 45 0 0.0 Feb/2009

Subjects: Science Essays > Biology > Plant Biology

The Life Cycle of Coral Reefs

ing process is a beautiful chemical conversation.Reef-building corals initiate photosynthesis as sunlight penetrates the waters of clear warm, tropical shallows where coral thrive. Under proper condit ... hrive. Under proper conditions, sunlight can provide millions of microscopic algae with a source of light energy for conversion of chemical energy.Ninety-eight percent of the coral’s food comes f ...

(3 pages) 40 1 0.0 Mar/2009

Subjects: Literature Research Papers > Creative Writing > Descriptive Essays

Chemistry Study Notes - Electrons and Light

Electric and magnetic components to every light wave-speed of light is always constant-speed of light = wavelength x frequency (c = λv) ... light is always constant-speed of light = wavelength x frequency (c = λv)Particle Nature of Light-matter can gain or lose energy only in small, specific amounts called quanta-a quantum is the ... an emit or absorb energy only in whole-number multiples of h-can’t use the wave description of light to explain this phenomenon (light energy is not wave like, but particle-like of specific sizes ...

(4 pages) 18 3 4.0 Mar/2009

Subjects: Science Essays > Chemistry