• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating Gas Production By a Green Plant During Photosynthesis.

Extracts from this document...


INVESTIGATING GAS PRODUCTION BY A GREEN PLANT DURING PHOTOSYNTHESIS INTRODUCTION: To investigate gas production by a green plant during photosynthesis. Photosynthesis occurs only in the presence of light, it 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: AIM: I am going to investigate how varying light intensity will affect gas production by a green plant during photosynthesis in a plant. To do this I will need to cut a piece of Canadian pondweed and place it into a beaker containing a little bit of sodium hydrogen carbonate. A lamp will be shined onto the pondweed and the amount of bubbles released from the plant will be counted. The lamp will be adjusted to different distances from the plant to try and get different results. FACTORS WHICH AFFECT THIS REACTION ARE: * Light Intensity * Carbon Dioxide * Water * Temperature LIGHT INTENSITY: Pigments in the leaf such as chlorophyll take in light. Chlorophyll absorbs all different coloured types of light, it absorbs blue light, and also easily absorbs red light, and however, chlorophyll does not absorb green light or yellow light effectively. But it tends to reflect them, which decreases the amount of light absorbed, and therefore the rate of photosynthesis. ...read more.


Light energy travels along the circumference of an expanding circle. When light energy is released from a point, the energy is dispersed equally along the circumference. APPARATUS: * A beaker * Cold water * Measuring cylinder * Canadian Pondweed * Knife * White tile * Stop watch / Clock * A meter ruler * Bench lamp * A beaker containing sodium hydrogen carbonate * Scalpel * Scissors DIAGRAM: FAIRNESS: To ensure the experiment is done fairly the following things must be done. The pondweed must be used every time we change the light distance. I will repeat the experiment 5 times for accuracy. There should be only be one variable that I investigate and that is the light intensity. Take the results after every 2 minutes. I also need to use the same lamp when I repeat the experiment so that the intensity of light does not vary. SAFETY: To ensure that the experiment goes safely I have to do the following things. I will need to wash my hands after handling the pondweed for hygiene. Also make sure there are no water spillages on the floor on near the lamp, as this can cause an electric shock. When handling the scalpel. Always follow the laboratory rules. METHOD: * Collect all the apparatus and set it up. * Cut a steam of Canadian pondweed. ...read more.


This has happened with a slight variation with all the distances. My results and scientific knowledge support my prediction very well. They prove that the factor of light intensity does affect the rate of photosynthesis. My knowledge of photosynthesis also supports my prediction and conclusion. EVALUATION: Overall, I have felt that my experiment did go well, however, I do feel the photosynthesis investigation was probably not performed as accurately as it could have been due to some controllable and uncontrollable conditions. Sometimes the piece of pondweed did not photosynthesise at a steady rate; this could be due to the fact that the pondweed was not cut accurately. Also, the measuring of distances between the measuring cylinder with the pondweed in it and the lamp could have been a bit inaccurate and could have been measured properly this could have been a major negative point to my results. The spreading of sodium hydrogen carbonate in the measuring cylinder could have been inaccurate that's why my results could have varied. However, I do feel my time keeping was good; I was and tried to be as accurate as possible with this. I could have improved my investigation by cutting the pondweed properly and measuring the distances between the measuring cylinder and the lamp could have been a bit more accurate. To plot my results for the average graphs I did have to round the numbers up to an integer they may have become less accurate, apart from that I feel I plotted my results as best as I could. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Free essay

    Solar Desalination Plant

    * The energy requirement of this pump is 4027KJ/day. This is for one tank. We are operating 2605 tanks simultaneously. Figure 6: Fresh water pump; model 15075HS18 Brine pump * Pump used to remove brine and other impurities from pressure vessel.

  2. How temperature affects the rate of photosynthesis.

    the results are statistically incorrect. Table of t test values (the values are correct to 2 decimal places): Degrees of freedom Value of t 1 6.31 12.7 63.7 636 2 2.92 4.3 9.93 31.6 3 2.35 3.18 5.84 12.9 4 2.13 2.78 4.6 8.61 5 2.02 2.57 4.03 6.87 6

  1. An Investigation into Species Diversity with distance along a Pingo.

    if there is a significant change in light levels along the pingo. The results will also be correlated against the species diversity index for each zone. pH This is a dependent variable. It will be measured at each zone. Soil sample will be taken at each zone.

  2. Investigate the factors that affect the rate of photosynthesis on a green plant.

    Water is a raw material for photosynthesis and essential to maintain leaf and cell turgor. Any moisture deficiencies to plants result in dehydration of cells and leaves wilting; these effects slow the rate of photosynthesis. Also when the plant is lacking water the stomata will close to reduce water loss.

  1. Absorption Spectrum of Chlorophyll.

    IEC -7000 Centrifuge 4. Absocol Refrigerator 5. Ultraviolet Lamp The spinach leaves were cut into small pieces which were then ground with a mortar and pestle. Okra pods were freed from seeds, cut into small pieces and similarly ground with a mortar and pestle.

  2. The aim of my investigation was to determine how limiting factors would affect the ...

    This results in a multilayered palisade parenchyma. Shade leaves in contrast perceive only a little light, the palisade parenchyma stays single layered. The enlargement of the palisade parenchyma causes usually a reduction of the spongy parenchyma, which is accordingly less well developed in sun leaves. As important as the exposition to light is the leaf's position at the stem.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work