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

An Investigation To Show How the Amount Of Sodium Hydrogen Carbonate Affects The Rate Of Photosynthesis In Pond Weeds.

Extracts from this document...

Introduction

An Investigation To Show How the Amount Of Sodium Hydrogen Carbonate Affects The Rate Of Photosynthesis In Pond Weeds. Investigation Outline: An experiment was planned and carrier out where the concentration of carbon dioxide available to a water plant was changed by varying the concentration of NaHCO in the water. However all the other factors that may have affected the rate of photosynthesis were carefully monitored and controlled. E.g. light intensity and temperature. Hypothesis: I predict that when the concentration of sodium hydrogen carbonate increase the rate of photosynthesis in the plant will also increase or 'speed up'. Results: Concentration of NaHCO Volume of O produced in Volume of O produced in (mol/dm3) 240 minutes cm3 240 minutes cm3 0 1.8 2.1 0.1 6.2 6.9 0.2 11.8 11.1 0.3 17.9 18.2 0.4 23.7 22.9 0.5 24.4 23.9 Calculations to show average oxygen production in 60 minutes (cm3): (1.8 + 2.1) /2 = 1.95/4 = 0.5 (6.2 + 6.9) /2 = 6.55/4 = 1.6 (11.8 + 11.1) /2 = 11.45/4 = 2.9 (17.9 + 18.2) /2 = 36.1/4 = 4.5 (23.7 + 22.9) ...read more.

Middle

Whereas the other concentrations were significantly increased compared to there predecessors. This leads me to believe that the rate of oxygen will no longer increase as the concentration of NaHCO is increased I believe this is because the NaHCO is no longer a limiting factor of the reaction. These results are what I expected as they do agree with my hypothesis. The increase in rate of photosynthesis because the more sodium hydrogen carbonate that was present meant there was more carbon dioxide readily available to the plant so it could reduce the carbon dioxide by the hydrogen that is present in the enzymes inside the chloroplast of the plants leaves and therefore speeding the rate of photosynthesis up and therefore leading to a greater rate of oxygen production in a given time. However in part (b) of the graph its seems to start to level out because there is only one result that shows this I am not able to state whether this could be due to anomalies (if this proves to be the case we would have to carry out another experiment with a greater range of results) ...read more.

Conclusion

then the carbon molecules will also be able to be reduced by the hydrogen molecules and so increasing the rate of photosynthesis. Another limiting factor of this reaction could be the temperature. If this is so this could mean the plants enzymes are unable to work at their optimum temperature and therefore working at a slower rate that causes the rate of reaction to decrease which will end up in a lower production of glucose molecules. Evaluation: Overall, I believe this experiment to be a fairly accurate and successful one as my result support my prediction. However if I were to do this experiment again I would try to keep the temperature at a constant because I am still unsure of the limiting factor in this experiment. To do this I could place the experiment in a water bath of a constant temperature. If I was to do this I would be sure of which limiting factor affected this experiment. Also I could try out various sizes of pond weed as larger pieces would have a larger surface area and a greater number of palisade cells available to the light and this would have an effect on the rate of photosynthesis. ...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. Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

    From the data collected and collated I plotted the points on a graph of the rate of photosynthesis (mm) against the concentration of sodium hydrogen carbonate (mol dm-3). This gave me one graph from the data collected. The graph shows the whole range of sodium hydrogen carbonate concentrations used and

  2. Investigating the factors, which affect the rate of photosynthesis in a pond plant.

    21 27 35 60 529 18 22 20 Analysis: The results that have been retrieved from each experiment and all the trials show good detail and accurate, positive results. The results show that the prediction made was correct. What was conclusive was that the higher the light intensity and the

  1. How temperature affects the rate of photosynthesis.

    the stomata not allowing any gaseous exchange and transpiration to take place. A diagram showing guard cells surrounding a stomata pore: [Diagram taken from http://www.lima.ohio-state.edu/academics/biology/images/stoma.jpg] Gaseous exchange depends on the opening and closing of the stomata which is controlled by the turgidity of the guard cells.

  2. Investigating the effect of temperature on the rate of photosynthesis

    It increased steadily from 24oC to 33oC on graph 2, where the average rate of oxygen released goes from 17mm3/min to 34.1mm3/min. This is because as the temperature increases the kinetic energy the enzyme rubisco has will also increase.

  1. INVESTIGATING HOW TEMPERATURE AFFECTS THE

    Next I will get forceps to transfer the beetroot into the test tube and start timing as soon as it is dropped in. I will time for 20 minutes to allow time to carry out each experiment in the time available and also that I carry the experiment out for a reliable amount of time.

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

    its significance and the strength of the relationship, if any was found. Statistical tests: Statistical tests were conducted on some of the results. All statistical tests have been done separately, by hand on paper. These include Spearman's Rank coefficient on species diversity and distance, species diversity and light intensity and species diversity and soil water content.

  1. Investigating how the amount of Hydrogen Peroxide will affect the speed in which the ...

    I am going to check my results every 15 seconds so that I can see whether there is a problem, as if there was my results wouldn't be moving at similar rates as the catalyst is the same so that it should be moving at the same speed because it's

  2. Investigation on How the Amount of Light Affects Photosynthesis.

    As I am going to investigate on how the amount of light affects photosynthesis I am going to use a lamp and move it away from a beaker. To do this I am going to use a plant called Elodea (a Canadian pondweed)

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