Photosynthesis and colour of light

Photosynthesis and colour of light PROBLEM I have been asked to investigate the link between wavelength of light and rate of photosynthesis. HYPOTHESIS I predict that the order of best absorption in a plat to produce more bubbles will be blue, yellow, orange, red and finally green. I predict this because blue has the shortest wavelength which produces the most energy and there is slightly higher absorption in the blue region by the plant. The red has the largest wavelength in the visible spectrum which produces the least energy. The reason why green is at the bottom of the list of absorption in a plant is because green is reflected off the plant and not absorbed as much as the others. It is reflected of the plant to be seen as green in our eyes. SCIENTIFIC KNOWLEDGE The spectral quality or colour of light is associated with its wavelength. Blue light has a shorter wavelength and higher frequency than red light. A simple table that indicates the wavelengths of colours in the visible spectrum is shown below. Wavelength (nm) Colour of light 400 Violet Indigo Blue 500 Green Yellow 600 Orange Red 700 In photosynthetic plants the pigments are very important. They absorb light energy and enable it to be converted into chemical energy which is used by the plants to make glucose and oxygen from carbon dioxide and water. Plants appear to be different colours because

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  • Level: GCSE
  • Subject: Science
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Light Intensity and Photosynthesis.

Light Intensity and Photosynthesis Biology Coursework Aim The aim of my experiment was to determine whether or not the intensity of light would affect the rate of photosynthesis in a plant. To do this, I placed a piece of Canadian pondweed in varying light intensities, and observed the amount of oxygen being given off. I used Canadian pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in water. Introduction Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for photosynthesis can be expressed as: (light) 6CO2 + 6H2O À C6H12O6 + 6O2 (in the presence of chlorophyll) The fact that all plants need light in order to photosynthesise has been proven many times in experiments, and so it is possible to say that without light, the plant would die. The reason that light intensity does affect the rate of photosynthesis is because as light, and therefore energy, falls on the chloroplasts in a leaf, it is trapped by the chlorophyll, which then makes the energy available for chemical reactions in the plant. Thus, as the amount of sunlight, or in this case light from a bulb, falls on the plant, more energy is absorbed, so

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  • Level: GCSE
  • Subject: Science
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How light intensity affects Photosynthesis.

P l a n Photosynthesis is the chemical process, which takes place in every green plant to produce food in the form of glucose. Plants use water and carbon molecules and the suns energy to join together to form glucose, which is sent around the plant to provide food. Cells in the root or stem can use the glucose to make energy, if the plant does not need to use all the glucose immediately then it is stored which is difficult because glucose is hard to store in water. Plants have adapted with this problem by joining hundreds of glucose molecules together to make a starch compound. Starch does not dissolve in water very well so it makes a better food store. Photosynthesis takes the palisade mesophyll cells in the leaf of a plant. It is these cells that contain the green chloroplasts and are very well adapted to their task. They are near the upper side of the leaf where they can obtain the maximum amount of light, they are packed very closely together and contain a green pigment called chlorophyll, and these absorb the sunlight and therefore help greatly to the production of photosynthesis. The cells are arranged like a fence, these help the energy entering the surface (top) of the leaf to travel a long way through the palisade cells. To obtain the most sunlight as possible, leaves have a large surface area and the more sunlight the plant receives, the better it can

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  • Level: GCSE
  • Subject: Science
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How Light Affects Photosynthesis.

Title: How Light Affects Photosynthesis. Aim: My aim was to investigate how light affected photosynthesis. Prediction: My prediction is that the closer the weed is to the light the faster the photosynthesis as light acts as a catalyst which speeds it up. Bibliography: For my work I used the internet and certain science books for info. Hypothesis: Photosynthesis is a 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 doing so, photosynthesis provides the basic energy source for virtually all organisms. An extremely important by product of photosynthesis is oxygen, on which most organisms depend. Factors that affect Photosynthesis * Light affects the rate of photosynthesis, it is the main energy source, and this is what we are testing in this investigation. * Carbon Dioxide is a raw material which affects the rate of photosynthesis * Water also affects the rate of photosynthesis; this water mostly comes from the roots. * Chlorophyll is the miracle molecule which actually makes photosynthesis The word equation for photosynthesis is: Carbon Dioxide + Water Light Glucose + Oxygen 6CO2 + 6H2O Chlorophyll C6H12O6 + 6O2 + Energy Things needed for Photosynthesis * Light * Carbon Dioxide * The right

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  • Level: GCSE
  • Subject: Science
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Investigation: Photosynthesis & Light Intensity

GCSE SCIENCE INVESTIGATION: PHOTOSYNTHESIS & LIGHT INTENSITY Aim: The aim of this experiment is to investigate how the intensity of light will affect the rate of photosynthesis in Kabambe (pondweed). To do this, Kabambe was placed in varying light intensities to test the amount of bubbles given off from a cut end to show the rate of photosynthesis occurring. Intro: Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for photosynthesis can be expressed as: (light) 6CO2 + 6H2O = C6H12O6 + 6O2 (in the presence of chlorophyll). Now from most experiments involving photosynthesis it has been seen that without light, the plant or organism will most certainly die. This is to rule out one null hypothesis that without light, no photosynthesis will take place. Light intensity affects the rate of photosynthesis because firstly a change in value would directly change the balancing factor of the equation, as stated above, therefore raising a output of the equation, e.g. most light would need more carbon dioxide and water to increase the amounts of glucose and oxygen, without there will be a limiting factor to the amount of light that can be put into the input part of the

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  • Level: GCSE
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Photosynthesis and Light intensity

PLANNING A Aim: The aim of this experiment is to investigate the effect of different light intensities on the rate of photosynthesis Theory & Hypothesis: The photosynthesis rate is often measured by the amount of carbon dioxide absorbed or oxygen evolved by a plant. With increase in light intensity, photosynthesis begins, and some carbon dioxide from respiration is utilized in photosynthesis. As light intensity increases, there is an increase in the rate of photosynthesis, and this light intensity can be increased or decreased by bringing the source of light closer to or further away from the plant. Hypothesis: Hence, we can predict that with increase in light intensity, the rate of photosynthesis would also increase. Variables: The variables in the experiment are light intensity and the rate of photosynthesis. The independent variable is light intensity, which is adjusted by modifying the position of the lamp. The dependent variable is the rate of photosynthesis or the rate of bubble production which is affected by the varying light intensity. PLANNING B Apparatus & Materials: . Water plant (Hydrilla) 2. dil.sodium hydrogen carbonate solution 3. Thermometer 4. Boiling test-tube 5. Beaker 500 ml 6. Retort stand 7. Lamp (60W bulb) 8. Ruler 9. Stop-watch Procedure: . Place the hydrilla in a test-tube filled with dilute sodium hydrogen carbonate solution 2.

  • Word count: 559
  • Level: International Baccalaureate
  • Subject: Biology
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How light affects the rate of photosynthesis

How light affects the rate of photosynthesis Aim To see how light affects the rate of photosynthesis Introduction Photosynthesis occurs only when light is present, and takes place in the chloroplasts of green plant cells. The definition of photosynthesis is the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for photosynthesis can be expressed like this: (Light) 6CO2 + 6H2O C6H12O6 + 6O2 (In the presence of chlorophyll) Also the word equation can be expressed like this: Light CO2 + H2O Glucose + O2 Chlorophyll Plants need light to photosynthesis, and so that without light, the plant would die. The reason that light intensity does affect the rate of photosynthesis is because the light energy is absorbed by the chloroplasts and then the chlorophyll makes then energy for the plant to use. There for if the more light taken by the chloroplasts (to a certain limit depending on the plant) the faster photosynthesis will take place. There are many factors, which affect the rate of photosynthesis, including light intensity, temperature and carbon dioxide concentration. The maximum rate of photosynthesis will be constrained by a limiting factor. This factor will prevent the rate of photosynthesis from increasing above a certain level, even if the other conditions

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  • Level: GCSE
  • Subject: Science
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Effect of light on photosynthesis.

Aim: Effect of light on photosynthesis. What is photosynthesis? Plants need and use the same light of foods as animals but while animals have to eat other things to get their food, plants make it themselves. The way they do this is called photosynthesis. The other ways that plants are different from animals, such as having leaves and root or being green, they are all linked with photosynthesis. In photosynthesis, plants take carbon dioxide from the air and water from the soil, and use the energy from the sunlight to convert them into food. The first food they make is glucose but that can later be changed into other food types. The sunlight is absorbed by the green pigment chlorophyll. Carbon hydrates contain the elements carbon, hydrogen, and oxygen as in glucose. The carbon and oxygen could be supplied by carbon dioxide from the air. In addition, the hydrogen could come from the water in the soil. The nitrogen and sulphur needed for making protein could come from nitrates and sulphates in the soil. This builds up of complex food molecules from simpler substances this is called synthesis. It needs enzymes and energy to make it happen. Enzymes are presented in the plants cells and the energy for the first stages in the synthesis comes from sunlight, this is called photosynthesis. And that there is a green substance and chlorophyll. Chlorophyll is in the chloroplasts of

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  • Level: GCSE
  • Subject: Science
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How does light intensity affect photosynthesis?

Introduction Photosynthesis is a very important process in nature. Photosynthesis is a biochemical reaction used to produce glucose using light energy, water and CO2 (Carbon Dioxide). A bye product of the reaction, photosynthesis, is Oxygen. It takes place in all green plants, which use the green chlorophyll, held in chloroplasts in the leaves, to trap light. The main site of photosynthesis is the palisade mesophyll cells in the leaf of a plant. It is these cells that contain the green chloroplasts and are very well adapted to do their task. They are near the upper side of the leaf where they can obtain the maximum amount of light, they are packed very closely together and as already mentioned contain green chloroplasts clustered towards the upper side too. Plants photosynthesise to produce food chemicals that are needed to allow them to grow. The main reaction is to produce oxygen and glucose to be changed into energy during respiration. Glucose is stored in the form of starch which is insoluble and does not affect the osmosis taking pace in the plant. As plants respire both day and night this starch is often used up during the night when photosynthesis cannot take place. The uses of glucose within the plant are for active transpiration, cell division, the production of protein and the production of cellulose. Light energy is used to break down the bonds in water and

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  • Level: GCSE
  • Subject: Science
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The Affect Of Light On Photosynthesis.

Shane Garvin The Affect Of Light On Photosynthesis Glucose is absolutely essential in order for plants to work properly as it is used for: * Transporting other substances around the plant * Making fruits (important for seed dispersal) * Making proteins with nitrates * For respiration To produce glucose (energy) plants photosynthesise. Photosynthesis is a process that takes place in the leaves of all green plants to change light energy into chemical energy. There are three materials needed for this process, they are carbon dioxide, oxygen and light energy. The three things enter the leaves in different ways. Light energy (normally from the sun) is absorbed into the leave by chlorophyll. This is the green substance is in the chloroplasts (which live in the palisade cell at the top of the leaves). Water comes up the stem from the soil and carbon dioxide comes from the air around the leaves. The equation for photosynthesis is: Carbon Dioxide + Water Glucose + Oxygen There are three equally significant factors that affect the rate of photosynthesis, they are: * The amount of carbon dioxide * The temperature * The amount of light I now wish to investigate the affect the above has on photosynthesis, in particular light. To do this I will need: * A test tube * A lamp * A ruler * A piece of elodea plant. * 50ml water There are a

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  • Level: GCSE
  • Subject: Science
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