Preview

Investigation on how light intensity affects the rate of Photosynthesis.

Good Essays
Open Document
Open Document
640 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
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 basic energy source for the plant. Photosynthesis occurs in leaves that contain specialized cell structures called chloroplasts. Chloroplasts contain molecules of a green pigment called chlorophyll, 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, which means there is more change of light hitting a chloroplast. Light is a very important factor when it comes to the process of photosynthesis, without light the reaction cannot be carried out and no glucose can be made. Light intensity is one of the factors that affect the rate of photosynthesis and that is what our experiment is based on:

Aim: In this experiment we shall investigate how the rate of photosynthesis (measured by the increased volume of oxygen) is affected by changes of light intensity in water plants.

Hypothesis: I predict that as the intensity of light increases, so will the rate of photosynthesis. Furthermore, I hypothesise that if the light intensity increases, the rate of photosynthesis will increase at a proportional rate.

Variables:

Constant VariedMeasured

ShootLight intensityRate of photosynthesis

Number of lightsDistance between light and pondweedNumber of Bubbles

Water ------

Time between each result recording ------

Materials:

- Beaker almost full of water

- Pondweed

- 60 watt Lamp

- Ruler

- Stopwatch

- Short-stemmed Funnel

- Test Tube

-paper clip

-pure CO2

Method:

1. First clip that end of the pondweed that was not cut.

2. Then place a short-stemmed funnel over some pondweed in a beaker of water. Add pure CO2 to the beaker of water.

3. Fill a test tube with water and place it upside-down over the funnel stem.

4. Place the 60watt lamp at these distances away from

You May Also Find These Documents Helpful

  • Good Essays

    3. Based on what you already know about photosynthesis, write a testable hypothesis to explain the influence of an increase in light intensity on the photosynthetic rate in tomato leaves.…

    • 725 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    C: Explore the factors that can affect the pathways and the rate of photosynthesis in plants…

    • 1319 Words
    • 6 Pages
    Powerful Essays
  • Good Essays

    Spinach Lab Report

    • 1619 Words
    • 7 Pages

    More specifically, however, this experiment focused on the photo part of photosynthesis, or the light dependent reactions in chloroplasts. Light dependent reactions require the presence of light to function, so that this light can be taken to create ATP and to reduce NADP+ to NADPH. Consequently, light dependent reactions shut down in the absence of light, thereby stopping the production of ATP and NADPH (Sadava et al. 2012). With this information, an experimental hypothesis can be formed that the presence of light will cause the redox activity of the spinach chloroplasts to increase, while the absence of light will cause this activity to decrease. One possible null hypothesis could be that there will be no significant difference in redox activity between spinach chloroplasts that are under light and in the dark. Therefore, the alternative hypothesis must be that there will be a difference in this activity between the two groups of chloroplasts. To test these hypotheses, chloroplasts were extracted from spinach leaves in order to create enriched chloroplasts, which were a vital…

    • 1619 Words
    • 7 Pages
    Good Essays
  • Satisfactory Essays

    Photosynthesis Lab Report

    • 566 Words
    • 3 Pages

    Photosynthesis is a process to which some autotrophs such as plants produce their own food. It has two stages or reactions light-dependent and light-dependent reactions. The light dependent reactions are the first stage, where energy from sunlight is captures in Photosystem 2 and then 1, the electrons generated in Photosystem 1 then moves along the electron transport chain. The moving of electrons causes a hydrogen ion gradient that is used in the final step to produce ATP, by the ATP Synthase. The equation for this reaction is 6CO2 + 6H2O  C6H12O6+6O2 or, carbon dioxide +water sugars + oxygen . This reaction takes place on the thylakoid membrane of the chloroplast and uses energy from sunlight to produce compounds like ATP and NADPH. The second stage of photosynthesis is the Calvin Cycle, which takes place in the stoma of the chloroplast. This stage is light-independent or it does not need energy from sunlight. During this reaction ATP and NADPH from Stage 1are used to produce high energy sugars. The reaction is 3CO2 + 6NADPH + 5H2O + 9ATP  G3P + 2H+ + 6NADP+ + 9ADP + 8Pi . Additionally, the three limiting factors of photosynthesis are the light intensity, carbon dioxide concentration, and the temperature. Lastly, the items used in this particular experiment were baking soda to provide CO2, a light to excite the electrons in stage 1, distilled…

    • 566 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Rubisco Research Paper

    • 1149 Words
    • 5 Pages

    Irradiance limits the overall rate of photosynthesis under low light conditions. As irradiance increases, photosynthesis…

    • 1149 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Enzyme Lab

    • 1242 Words
    • 6 Pages

    3. Obtain 20 mL hydrogen peroxide and dilute it by adding 20 mL of distilled water. Place solution in a beaker and label as “1.5% Hydrogen Peroxide.”…

    • 1242 Words
    • 6 Pages
    Good Essays
  • Good Essays

    • Design a scientific experiment to determine the effect of the variable on the rate of photosynthesis for the organism…

    • 633 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    1. Based on the simulation experiments, what factors can affect the rate of photosynthesis in a plant?…

    • 553 Words
    • 3 Pages
    Satisfactory Essays
  • Better Essays

    In order to begin this experiment you must begin by wrapping the “BioChamber” with aluminum foil to prevent light from coming through to the leaves, however, once the lid has been covered you are to poke holes so you can insert the sensors. Next, you will cover the bottom of the “BioChamber” with one layer of turgid spinach leaves and proceed by connecting the Gas Sensor to Channel 1 and the O2 Gas to Channel 2 of the “Vernier computer interface”. Once the file “31C Photo (CO2 and O2)” is opened you can secure the lid on the chamber and insert the sensors into the holes that you previously made. After 15-minutes of data being collected you can observe the data. Now that you have completed the light independent reaction, you can begin by setting up the light dependent reaction. First, assemble the lamp without turning it on until told to do so. Remove the aluminum foil and align the bottom of the chamber with turgid spinach leaves. Re-secure the lid on the chamber and connect the sensors. Place the chamber inside the bulb and turn on the lamp. You will then reopen the selected file and review 15-minutes of collected data.…

    • 1015 Words
    • 5 Pages
    Better Essays
  • Good Essays

    Photosynthesis Lab

    • 1012 Words
    • 5 Pages

    HYPOTHESIS: I predict that the rate of oxygen produced increases, as the light intensity increases, but only to a point. I predict this will happen because the plant will have enough carbon dioxide and water to keep up with the amount of light that there is. When there is less light intensity, photosynthesis will happen at a slower rate because gradually there will not be enough sunlight as there is carbon dioxide and water.…

    • 1012 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    Photosynthesis Lab

    • 279 Words
    • 2 Pages

    Hypothesis: I predict that the wavelength intensity will affect the rate of photosynthesis more than light intensity will.…

    • 279 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Elodea Lab

    • 1281 Words
    • 5 Pages

    variables to be tested for their effects on photosynthetic rate. The production of oxygen, is used…

    • 1281 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Light Reaction Lab

    • 477 Words
    • 2 Pages

    This lab explores the effect of light intensity and light wavelength on photosynthesis. The quantity of energy [ATP] produced will change depending upon on these parameters.…

    • 477 Words
    • 2 Pages
    Good Essays
  • Powerful Essays

    2) Measure 10 ml of 0.1 molL-1 of Sodium Hydroxide solution using another measuring cylinder.…

    • 1292 Words
    • 6 Pages
    Powerful Essays
  • Satisfactory Essays

    If i increase the intensity of the rate of photosynthesis would drastically increase which is the light bubbles would be emitted in the jar in one minute because of the fact that the more photons of light that fall on a leaf then more chlorophyll molecules would be ionised and the more ATP and NADPH are generated If i increase the intensity of the rate of photosynthesis would drastically increase which is the light bubbles would be emitted in the jar in one minute because of the fact that the more photons of light that fall on a leaf then more chlorophyll molecules would be ionised and the more ATP and NADPH are generated fadsfIf i increase the intensity of the rate of photosynthesis would drastically increase which is the light bubbles would be emitted in the jar in one minute because of the fact that the more photons of light that fall on a leaf then more chlorophyll molecules would be ionised and the more ATP and NADPH are generated…

    • 571 Words
    • 3 Pages
    Satisfactory Essays