41. Biology4Kids.com: Plants photosynthesis is the process that allows plants to take energy from the Sun A little more about photosynthesis. plants are able to turn sunlight into http://www.biology4kids.com/files/plants_main.html

PLANT BASICS If you're not a microbe and you're not an animal, chances are you are a plant. There are loads of species of plants on Earth. Just as there is a system of classification for animals, there is also a system of classification for plants. Because plants adapt so well to any climate, scientists need a way to organize the hundreds of thousands of species. WHAT MAKES A PLANT? What do they all have in common? The big thing that connects plants is photosynthesis . Photosynthesis is the process that allows plants to take energy from the Sun and create sugars. We go into detail about the whole process in another tutorial. Plants also have cell walls . In the cells tutorials we explained that all cells have a membrane. Only plants have a cell wall made from cellulose A little more about photosynthesis. Plants are able to turn sunlight into energy but not directly. Plants are actually able to store energy in some chemical bonds that can be used later. Before we get into details, we'll explain that there are two processes on Earth: Photosynthesis and respiration. Photosynthesis stores the energy and respiration releases that energy. It all starts with the Sun. Check out the tutorial on photosynthesis. LEARNING FROM PLANTS Not only do you see plants everywhere in the real world, but they are also all over the scientific world. Scientists use them for studies in

42. Nature Works - Photosynthesis Duck plants use a process called photosynthesis to make food. During photosynthesis,plants trap light energy with their leaves. plants use the energy of http://www.nhptv.org/natureworks/nwepphotosynthesis.htm

Photosynthesis Energize! Plants use a process called photosynthesis to make food. During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose . Glucose is used by plants for energy and to make other substances like cellulose and starch . Cellulose is used in building cell walls. Starch is stored in seeds and other plant parts as a food source. That's why some foods that we eat, like rice and grains, are packed with starch! True Colors Most plants contain a special colored chemical or pigment called chlorophyll that is used in photosynthesis. Chlorophyll is what absorbs the sun's energy and turns it into chemical energy. Not all the light energy from the sun is absorbed. Sunlight has many different colors in it. Chlorophyll usually absorbs red and blue light from the sun and reflects green light. It's the green light reflecting that makes some leaves look green! In the fall, some plants stop producing chlorophyll and we see leaves change color. With the chlorophyll gone, the green light is not being reflected anymore! Image Credits: Clipart.com

43. Photosynthesis Examples of photosynthetic organisms leaves from higher plants flanked by Figure 6 Overview of photosynthetic processes as they occur in plants, http://photoscience.la.asu.edu/photosyn/education/photointro.html

An Introduction to Photosynthesis and Its Applications By Wim Vermaas Professor, School of Life Sciences, and Center for the Study of Early Events in Photosynthesis Arizona State University wim@asu.edu http://www.worldandi.com/ The Basics. Sunlight plays a much larger role in our sustenance than we may expect: all the food we eat and all the fossil fuel we use is a product of photosynthesis, which is the process that converts energy in sunlight to chemical forms of energy that can be used by biological systems. Photosynthesis is carried out by many different organisms, ranging from plants to bacteria (Figure 1). The best known form of photosynthesis is the one carried out by higher plants and algae, as well as by cyanobacteria and their relatives, which are responsible for a major part of photosynthesis in oceans. All these organisms convert CO (carbon dioxide) to organic material by reducing this gas to carbohydrates in a rather complex set of reactions. Electrons for this reduction reaction ultimately come from water, which is then converted to oxygen and protons. Energy for this process is provided by light, which is absorbed by pigments (primarily chlorophylls and carotenoids). Chlorophylls absorb blue and red light and carotenoids absorb blue-green light (Figure 2), but green and yellow light are not effectively absorbed by photosynthetic pigments in plants; therefore, light of these colors is either reflected by leaves or passes through the leaves. This is why plants are green.

44. Autumn Leaves - Why Do Leaves Change Color In Fall? The way plants turn water and carbon dioxide into sugar is called photosynthesis . A chemical called chlorophyll helps make photosynthesis happen. http://photoscience.la.asu.edu/photosyn/education/colorchange.html

WHY DO LEAVES CHANGE COLOR IN THE FALL? by SCIENCE MADE SIMPLE Science Made Simple Science Subjects Science in the News Measurement Conversions PO Box 503, Voorhees, NJ 08043 I Can Read Word Puzzle Learn More About: How plants prepare for winter Projects We all enjoy the beautiful show of colors as leaves change each autumn. Did you ever wonder how and why this happens. To answer that question, we first have to understand what leaves are and what they do. Leaves are nature's food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into sugar is called photosynthesis. That means "putting together with light." A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter.

45. Photosynthesis photosynthesis. Do plants sleep? Yes. At night time, plants can not make food, What does photosynthesis mean? happy seed. RETURN TO plants AND OUR http://library.thinkquest.org/3715/photo3.html

Main Page What Is a Flower Pollination Spreading Seeds ... Hinkle Creek Photosynthesis Do plants sleep? Yes. At night time, plants can not make food, so they shut down by closing their stomata. Animals inhale oxygen and exhale carbon dioxide . Green plants are the only plants that produce oxygen and make food, which is called photosynthesis . Photosynthesis means ''putting together with light.'' This takes place in chloroplasts , which have chlorophyll in them. Chlorophyll absorbs the sunlight. From sunlight, green plants combine carbon dioxide and water to make sugar and oxygen. Green plants use sugar to make starch fats , and proteins . There are tiny pores called stomota. Oxygen and carbon dioxide enter and leave through the stomata What does photosynthesis mean? RETURN TO PLANTS AND OUR ENVIRONMENT MAIN PAGE NEXT PAGE ANSWER Main Page ... Hinkle Creek Plants and Our Environment Authors: The Hinkle Creek ThinkQuest Team Plants and Our Environment Graphics: Acknowledgements

46. Plants And Our Environment How plants Grow Germination photosynthesis Our Environment Glossary View Our Guestbook If you would like to have your comments added to our http://library.thinkquest.org/3715/

Plants And Our Environment This web site is about plants. You will learn about how plants grow and the different parts of a plant. We will tell you how seeds travel and what bees do to help plants. At our web site, you will also learn about plants and their relationship with animals. Students and teachers, be sure to check out our page with plant activities. Please sign our guestbook and let us know what you think. We created a survey for you to fill out because we would like to learn about plants and animals where you live. We decided to make this web site to be used as a reference for people studying plants. In the fall of 1997 our fourth grade class did a unit on plants and found little information on the web. We also did a unit on endangered animals, so we decided to gather information on plants and endangered animals. We used KidPix for all our graphics and Microsoft 3.0 for our reports. We wanted our web site to be simple so all our teachers could use it. At that time our our teachers had Macintosh LC520s in their rooms. Our school already had the KidPix and Microsoft software on every computer. At the bottom of this page you will find a link to Hinkle Creek Elementary School What is a Flower?

47. Photosynthesis. The Columbia Encyclopedia, Sixth Edition. 2001-05 Importance of photosynthesis. Animals and plants both synthesize fats and proteinsfrom carbohydrates; thus glucose is a basic energy source for all living http://www.bartleby.com/65/ph/photosyn.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. photosynthesis (f s s s) ( KEY ) , process in which green plants utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Some of the plants that lack chlorophyll, e.g., the

48. Plants: Photosynthesis | EThemes | EMINTS These sites focus on photosynthesis and plant growth. There are animations thatdemonstrate the photosynthesis process, and how plants grow as well as http://www.emints.org/ethemes/resources/S00001575.shtml

About eMINTS Communities Equipment eThemes ... eThemes Plants: Photosynthesis Contact eThemes@emints.org if you have questions or comments about this resource. Printer-friendly version Please preview all links before sharing in class with students. Title: Plants: Photosynthesis Description: These sites focus on photosynthesis and plant growth. There are animations that demonstrate the photosynthesis process, and how plants grow as well as activities, games, and songs. eThemes Resources on plant species, carnivorous plants, and plant's life cycles, plant's cell, and teaching with comedy are included. Grade Level: Resource Links: BBC: Science Living Things Learn about the different functions of plant parts. Activities and a test are included. NOTE: This site has a link that leads to discussion board. Biology of Plants: Making Food This site provides information about plants: how to start to grow, plant parts, making food, pollination, seed dispersal, plant adaptations and plants and life on Earth. BBC: Photosynthesis Read an article about how plants produce food and interesting facts about plants. NOTE: The Talk link on this site leads to discussion board.

49. Blue Planet Biomes - Plants The oxygen we breathe comes from plants. Through photosynthesis, plants takeenergy from the sun, carbon dioxide from the air, and water and minerals from http://www.blueplanetbiomes.org/plants.htm

The Importance of Plants Close to 2.5 billion years ago, the earth's surface and atmosphere were stable enough to support primitive life. Single-cell organisms began to develop in the seas that covered the planet. A simple organism known as blue-green algae appeared and spread across the seas. Blue-green algae used sunlight and water to make food, and in the process, created oxygen. As the blue-green algae grew in the earth's seas, they began to fill the atmosphere with oxygen. The oxygen that blue-green algae produced made it possible for other types of organisms to develop. Plants play the most important part in the cycle of nature. Without plants, there could be no life on Earth. They are the primary producers that sustain all other life forms. This is so because plants are the only organisms that can make their own food. Animals, incapable of making their own food, depend directly or indirectly on plants for their supply of food. All animals and the foods they eat can be traced back to plants. The oxygen we breathe comes from plants. Through photosynthesis, plants take energy from the sun, carbon dioxide from the air, and water and minerals from the soil. They then give off water and oxygen. Animals and other non-producers take part in this cycle through respiration. Respiration is the process where oxygen is used by organisms to release energy from food, and carbon dioxide is given off. The cycles of photosynthesis and respiration help maintain the earth's natural balance of oxygen, carbon dioxide, and water.

50. Photosynthesis Directory He discovered that it was the influence of sun and light on the plant that could or injured air and that it was taken up by plants in photosynthesis. http://web.mit.edu/esgbio/www/ps/intro.html

Introduction to Photosynthesis The Evolution of Photosynthesis Life theoretically originated on Earth 3.5 to 4 billion years ago. The atmosphere was thin: composed of methane, carbon dioxide, and water vapour. Any gaseous oxygen had been used up in the combustion (or oxidation) of materials when the Earth was very hot. The cooling water collected in pools, assimilating the nutrients from the rocks. As water evaporated, the nutrients concentrated, forming a rich soup. The first organisms would have made a good living off this food source, breaking down the complex molecules into water and carbon dioxide through respiration. Eventually, as life grew, the need arose to somehow resynthesize complex compounds, both to eat and to use for structure and function. Some organisms learned how to use the sun's energy to synthesize large molecules from small molecules. Other organisms learned to use other sources of reductive power. These organisms who have learned how to build the building blocks of life are called autotrophs , or self-feeders. Autotrophs are found in the bacterial and in the plant kingdom.

51. Photosynthesis Quiz photosynthesis Quiz Did you know that plants are not the only organisms capableof photosynthesis? Test your knowledge of photosynthesis. http://biology.about.com/b/a/190036.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Homework Help Biology Homework Help ... Help w(' ');zau(256,140,140,'el','http://z.about.com/0/ip/417/C.htm','');w(xb+xb+' ');zau(256,140,140,'von','http://z.about.com/0/ip/496/7.htm','');w(xb+xb); FREE Newsletter Sign Up Now for the Biology newsletter! See Online Courses Search Biology Photosynthesis Quiz Biology Blog Main From Regina Bailey Your Guide to Biology FREE Newsletter. Sign Up Now! July 31, 2005 Photosynthesis Quiz Did you know that plants are not the only organisms capable of photosynthesis? Test your knowledge of photosynthesis. Take the Photosynthesis Quiz! Email to a Friend Display Latest Headlines Read Archives powered by Movable Type Advertisement Most Popular Anatomy of the Brain - Organs of the Body Biology Science Fair Project Ideas Journey into the Cell: Mitochondria Journey into the Cell: Ribosomes ... Biology Prefixes and Suffixes What's Hot Biology Prefixes and Suffixes - form Biology Prefixes and Suffixes Quiz Biology Prefixes and Suffixes - tachy Biology Prefixes and Suffixes - ambi ... Biology Prefixes and Suffixes - gram Related Topics Animals / Wildlife Chemistry Physics Geology ... Patent Info.

52. Photosynthesis photosynthesis is the making of food by plants. photosynthesis is necessarynot just for plants to make food for themselves, but for animals, http://www.mcwdn.org/Plants/Photosynthsis.html

Chlorophyll Sunlight Water Carbon Dioxide PHOTOSYNTHESIS When you have finished this page, try the Photosynthesis Quiz. Photosynthesis is the making of food by plants. The essential ingredients in making this food are sunlight, the chlorophyll that is present in green plants, water and carbon dioxide in the air. Photosynthesis is necessary not just for plants to make food for themselves, but for animals, including us eventually. How does photosynthesis occur? Water is taken in through the roots of the plant and transported to the leaves by the xylem (tubes that carry water) in the stems. Carbon dioxide animals breathe out from the air goes into the leaves through the tiny pores called stomata and is spreads to the cells that contain chlorophyll in the inside layer of the leaf. Sunlight is used to break down the water in the plant into oxygen which the plant gives off and we use to breathe. The hydrogen is then used with the carbon dioxide to create the food for the plants and ultimately food for animals as well. Plants Main Page How Plants and Animals Differ Photosynthesis Algae ... Seeds

53. Photosynthesis And Respiration -Forest Ecosystems Of Canada photosynthesis is the process whereby plants, in the presence of light, plants respire both during the day and at night. However, photosynthesis takes http://www.cfl.scf.rncan.gc.ca/ecosys/dynamic/photosyn_e.htm

Contact Us Help Search Canada Site ... Acknowledgements Photosynthesis and Respiration Photosynthesis Photosynthesis is the process whereby plants, in the presence of light, manufacture their food and build stores of energy. This phenomenon takes place in plant cells that contain chlorophyll, a pigment that gives plants their green colour. Most of the chlorophyll in a plant is found in its leaves. Chlorophyll captures light energy and uses it to produce carbohydrates (sugars) from carbon dioxide (CO ) and water. This reaction also produces oxygen, which is released into the atmosphere. The reaction can be described as follows: The carbohydrates produced by photosynthesis are used by the plant in several ways: as a source of immediate energy (through respiration) in order to function, grow, reproduce, absorb nutrients , etc.;

54. Carbon Cycle - Forest Ecosystems Of Canada Through the process of photosynthesis, plants absorb carbon from the air (CO2) and photosynthesis by plants still fixes carbon, but an equal amount is http://www.cfl.scf.rncan.gc.ca/ecosys/dynamic/carbon_e.htm

Contact Us Help Search Canada Site ... Acknowledgements Carbon Cycle All living organisms are made up of molecules that contain carbon: carbo-hydrates, proteins and lipids. The carbon cycle includes all the reactions that allow living organisms to use carbon to manufacture their tissues and release energy. Plants are the starting point of the carbon cycle. Through the process of photosynthesis, plants absorb carbon from the air (CO ) and incorporate it into their biomass (leaves, wood, roots, flowers, fruits). This organic matter provides food for heterotrophic organisms (consumers). By releasing energy when they respire, heterotrophs and autotrophs return carbon to the atmosphere (CO In forest ecosystems A growing forest is a carbon sink ; in other words, it fixes more carbon through photosynthesis than the amount it releases via respiration. When the forest reaches maturity, an equilibrium is created between the quantity of carbon fixed and the amount released. While a forest contains carbon in its trees, in a northern climate, carbon is mostly stored in forest soils as:

55. Photosynthesis - Photolysis And Carbon Fixation photosynthesis is the means that primary producers (mostly plants) can obtain Some factors affect the rate of photosynthesis in plants, as follows http://www.biology-online.org/1/4_photosynthesis.htm

Forum Tutorials Dictionary Directory The Process of Photosynthesis in Plants Photosynthesis is the means that primary producers (mostly plants) can obtain energy via light energy. The energy gained FROM light can be used in various processes mentioned below for the creation of energy that the plant will need to survive and grow. Photosynthesis is a reduction process, where hydrogen is reduced by a coenzyme. This is in contrast to respiration where glucose is oxidised. The process is split INTO two DISTINCT areas, photolysis (the photochemical stage) and the Calvin Cycle (the thermochemical stage). The diagram below gives a summary of the reaction, where light energy is used to initiate the reaction in its presence; CO + H Photolysis This part of photosynthesis occurs in the granum of a chloroplast where light is absorbed by chlorophyll ; a type of photosynthetic pigment that converts the light to chemical energy. This reacts with water (H O) and splits the oxygen and hydrogen molecules apart. From this dissection of water, the oxygen is released as a by-product while the reduced hydrogen acceptor makes its way to the second stage of photosynthesis, the Calvin cycle. Overall, since the water is oxidised (hydrogen is removed) and energy is gained in photolysis which is required in the Calvin cycle

56. How Are Isotopes Affected By Plant Processes? So why don t all plants use C4 photosynthesis? The extra steps of fixing, Carbon isotope discrimination and photosynthesis. Annual Review of Plant http://gcte-focus1.org/activities/activity_13/task_133/basin/tutorial/physiology

How are isotopes affected by plant processes? Stable isotopes are a useful tool in plant physiology and ecology because isotopic fractionation occurs during both photosynthesis and transpiration - the basic physiological processes responsible for plant growth. Photosynthesis Photosynthesis converts CO in the atmosphere to carbohydrates, the building blocks of plant material. We can consider photosynthesis in two steps: 1) CO enters the leaf from the atmosphere and 2) it is fixed into carbohydrates in a process known as carboxylation . Isotopic discrimination occurs during both steps: In step 1, CO diffuses into leaves through adjustable pores on the leaf surface, or stomates . During diffusion, fractionation occurs as the heavier CO molecules diffuse more slowly. Thus, the air outside the leaf is slightly enriched in CO , and the air inside the leaf pore space is depleted in CO . The discrimination value for diffusion of CO In step 2 carboxylation occurs, but the details of carboxylation are different for two major pathways of photosynthesis that are found in plants. The most common pathway is called C photosynthesis , because the intermediate molecule in the process has three carbon atoms. In

57. Botany Online: Photosynthesis - C3, C4 And CAM. Regulation Of The Activity photosynthesis of C4 plants. CO2 is bound to phosphoenolpyruvate (PEP) in mesophyllcells. The product is oxaloacetate. The next step generates malate. http://www.biologie.uni-hamburg.de/b-online/e24/24b.htm

C , C and CAM. Regulation of The Activity of Photosynthesis C A number of plants display an increased and more efficient net photosynthesis during strong light intensities. A prime example are the Gramineae of warmer regions like maize or sugar-cane At the beginning of the sixties observed H. KORTSCHAK (Hawaiian Sugar Planter's Association) that the first product of photosynthesis in sugar-cane is not the C unit 3-phosphoglycerate but a unit with four C-atoms. The Australian plant physiologist M. D. HATCH and his English colleague C. R. SLACK confirmed this result and identified the compound as oxaloacetate (OAA) . It is produced by the addition of one molecule of carbon dioxide to phosphoenolpyruvate (PEP) . The cycle is also known as the HATCH- SLACK-cycle or the C cycle. Plants with this cycle are called C -plants (and CAM plants , respectively) in contrast to C plants where the carbon dioxide is directly fed into the CALVIN cycle. The oxaloacetate is usually converted into malate of which the carbon dioxide is split off again with the help of an enzyme. This carbon dioxide is now bound by ribulose-1,5-diphosphate and assimilated

58. Botany Online: Photosynthesis They cultivated plants under different but controlled carbon dioxide oxygen developed during the photosynthesis of green plants stems indeed from water http://www.biologie.uni-hamburg.de/b-online/e24/24.htm

Photosynthesis The Dark Reactions of Photosynthesis, Assimilation of Carbon Dioxide And The Calvin Cycle C , C and CAM. Regulation of The Activity of Photosynthesis ... Literature The observation that a willow that has been cultivated in a container for five years with enough watering gained more than half a centner weight although only two ounces of the container's soil were lost goes back to J.B. van HELMONT (1577 - 1644). The British natural scientist S. HALES (1677 - 1761) understood that air and light are necessary for the nutrition of green plants. But it was not before the composition of air out of different gases became known that their significance for plant nutrition was studies. In 1771 observed J. PRIESTLEY (1733 - 1804), one of the discoverers of oxygen, that green plants give off oxygen and thus improve the air. The priest J. SENEBIER (1742 - 1809) from Geneva discovered that the regeneration of the air is based on the use of 'fixed air' (carbon dioxide). These observations were confirmed and broadened by studies of the Dutch doctor J. INGENHOUSZ

59. Types Of Photosynthesis C3 photosynthesis is the typical photosynthesis tha most plants use and that saguaro CAM photosynthesis CAM plants. CAM stands for Crassulacean Acid http://wc.pima.edu/~bfiero/tucsonecology/plants/plants_photosynthesis.htm

plant terms flowering plant life cycle types of photosynthesis Tucson Mt. plants ... thumbnails by color TYPES OF PHOTOSYNTHESIS This page introduces you to photosynthesis and explains the three types of photosynthesis and their relevance for desert adaptation. Concepts Photosynthesis : the jamming together of CO (carbon dioxide) with H O (water) to make CH O (sugar) and O (oxygen), using the sun's energy. The sugar contains the stored energy and serves as the raw material from which other compounds are made. Respiration is the opposite of photosynthesis the stored energy in the sugar is released in the presence of oxygen, and this reaction releases the CO and H O originally jammed together by the sun's energy. Stomata : the "pores" in leaves (and stems) through which CO is taken in and O is released during photosynthesis. Plants control when stomata are open or closed and the width of the opening (formed by two guard cells that expand and contract to open and close the space between them). Transpiration : the water that evaporates out of stomata when they are open. This pulls more water and nutrients up to the top of the plant, but causes the plant to lose water and potentially dehydrate.

60. BBC - GCSE Bitesize - Biology | Green Plants | Photosynthesis Green plants are at the beginning of all food chains. plants are known as producers because only plants make their own food by building up carbohydrates, http://www.bbc.co.uk/schools/gcsebitesize/biology/greenplantsasorganisms/0photos

@import url('/includes/tbenh.css') ; Home TV Radio Talk ... A-Z Index SUNDAY 25th September 2005 Text only BBC Homepage Other Sites var jsversion = 1.0; var realInstalled = false; var wmpInstalled = false; var swpInstalled = false; var xmlHTTPEnabled = false; var xslEnabled = false; jsversion = 1.1; jsversion = 1.2; jsversion = 1.3; jsversion = 1.4; jsversion = 1.5; 'For IE detection... On Error Resume Next realInstalled = (IsObject(CreateObject("rmocx.RealPlayer G2 Control"))) wmpInstalled = (IsObject(CreateObject("MediaPlayer.MediaPlayer"))) swpInstalled = (IsObject(CreateObject("SWCtl.SWCtl"))) xmlHTTPEnabled = (IsObject(CreateObject("Msxml2.XMLHTTP"))) xslEnabled = (IsObject(CreateObject("Msxml2.DOMDocument"))) Site Guide Credits About the BBC Contact Us ... Help Like this page? Send it to a friend! Home Biology Green plants as organisms / Photosynthesis Biology Chemistry English Language English Literature French German Geography History ICT Maths Music PE Physics Religious Studies Spanish The Human Body Explore your body parts! Post ideas and check out Science messages here.

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