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

As you increase the concentration of Carbon Dioxide, this results in an increase in the rate of photosynthesis.

Extracts from this document...


Biology Coursework: The effects of Carbon Dioxide (CO2) on the rate of photosynthesis Hypothesis: As you increase the concentration of Carbon Dioxide, this results in an increase in the rate of photosynthesis. Introduction and Background: An overall and common equation for photosynthesis is: Light Energy 6CO2 + 6H2O C6H12O6 + 6O2 carbon + water in the presence glucose + oxygen dioxide of chlorophyll (B1) The process of photosynthesis transfers light energy into chemical potential energy of organic molecules. It is the fixation of carbon dioxide and its subsequent reduction to carbohydrate (glucose), using hydrogen from water. Leaf structure (B1) * The Palisade Mesophyll is the main site of photosynthesis. There are more chloroplasts here than there are in Spongy Mesophyll. * Palisade cells show many adaptations of gaseous exchange. > Palisade cells are cylindrical shaped. They pack together with long narrow air spaces between them giving a large surface area of the contact between the cell and the air. > The cell walls of the palisade cells are thin. This way, the gas can diffuse through much easily. * The Spongy Mesophyll is adapted for the exchange of carbon dioxide and oxygen. > The spongy Mesophyll has irregular packing of cells so that air can move around them. ...read more.


Therefore the cycle has to go around six times. During this cycle, 6CO2, 6RuBP and 12 NADPH2 are used. Enzymes * During the Calvin cycle, RuBP is carboxylated with CO2 with the assistance of the enzyme Rubisco (also known as RuBP Carboxylase). * However, if there is a high concentration of substrate, the rate of reaction would reach a plateau. * Because all of the enzyme would be unavailable as they would be reacting with other substrates. Rate of Reaction Substrate Concentration A: There is an increasing rate of reaction. Substrate molecules are binding to active sites at a rapid rate. Reason being, that there is a high probability than an enzyme's active site will collide with a substrate molecule. B: The active sites are beginning to become unavailable. Many substrate molecules have and still are binding to the active sites. C: There is too much substrate. The enzymes are working at a maximum rate. It is unable to handle the amount of substrate, as there are no more vacant active sites left. Other substrate molecules have occupied them all. Variables In this experiment, there are three constants and one variable. ...read more.


17. Repeat steps 4 - 16 at least two more times in order to obtain more accurate results. Work out an average of the three readings. 18. Carry out the experiment with all different concentrations of NaHCO3 [0.05 mol dm-3, 0.1 mol dm-3 0.2 mol dm-3, 0.3 mol dm-3, 0.4 mol dm-3] Justification The Elodea is left to equilibrate in the boiling tube filled with N, because it needs time to adapt to the conditions. I.e. adapting to the temperature of 300C A syringe is used in this experiment. This ensures precision as it is better than counting the oxygen bubbles. If you count the bubble, it is very easy to miscount them. Some bubbles may even be too small to see. Whereas when using the syringe, the total volume of oxygen is collected and it is easier to measure. Distilled water is used as it contains no impurities. E.g. No extra carbon dioxide. Cut the stem of the Elodea under water to prevent any air locks. This will ensure water enters the leaf without effecting photosynthesis. Reliability To ensure reliability, it is important that this experiment is repeated at least three times. This will give you an average, making the results more accurate. Use the same species of Elodea for each experiment. Precision The lamp should remain at a constant distance and have a constant intensity. I.e. ...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. Experiment to investigate the effect of Carbon Dioxide on the Rate of Photosynthesis

    the number of bubbles released from the elodea. Photosynthesis is a complex process that is affected by many factors. In the prediction it was assumed that as the concentration of carbon dioxide is doubled so will the rates of photosynthesis, however, this does not seem to be the case although there is a directly proportional relationship.

  2. This experiment involves using a photosynthometer to investigate how temperature affects the rate of ...

    The healthy strand of elodea produces bubbles of oxygen gas when brightly illuminated (i.e. with a bench lamp 10 cm away from the elodea specimen) at different temperatures. The bubbles emerge from the cut end of the stem and are collected in a bulb at the base of the apparatus.

  1. Effects of temperature and carbon dioxide on photosynthetic rate in Elodea.

    'Very good rates of photosynthesis can be obtained with a CO2 content of about 0.1%'6. The average CO2 content of the atmosphere is about 0.035%. Therefore plants in their normal environment do not have enough CO2 to make maximum use of sunlight falling on them.

  2. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    P680 receives replacement electrons from the photolysis of water. ATP is synthesised as the electrons lose energy whilst passing along the carrier chain, as in cyclic photophosphorylation. Below is a diagram of the 'Z scheme' of electon flow in photophosphorylation: Light-independent stage - The fixation of carbon dioxide is a

  1. Investigation To Find The Effect Of Temperature On The Rate Of Photosynthesis Of Elodea.

    As the amount of CO2 available increases, the rate of p/s increases, until the plant is photosynthesising as fast as it can - the CSP - CO2 Saturation Point. If both CO2 and light supply are increased together, the rate of p/s will level out.

  2. How temperature affects the rate of photosynthesis.

    than 95% confidence that the difference between the means of the two temperatures is significant showing that the results are statistically correct. If the t value is smaller than 2.06 i.e. the corresponding critical value of t (confidence level 5%), it can be deduced that by less than 95% confidence that the difference between the two means is significant i.e.

  1. How does the concentration of Carbon Dioxide affect the rate of photosynthesis?

    This chemical is used to catch the light energy needed in photosynthesis. Water enters plants through the roots. The roots are covered in millions of tiny root hair cells. These root hair cells have a large surface area so that the plant can absorb enough water from the soil.

  2. Experiment to investigate the effect of different concentrations of Carbon Dioxide on the rate ...

    Then a light will be shone on the measuring cylinder from a set distance and the amount of bubbles being produced in the measuring cylinder for a set period of time will be recorded. Two readings of bubble production will be taken.

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