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

Photosynthesis Investigation

Extracts from this document...

Introduction

Photosynthesis By Alun Tweedale 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 (glucose) from carbon dioxide and water, which then release sugar and oxygen. Belo is the chemical equation for photosynthesis: light 6CO2 + 6H2O C6H12O6 + 6O2 Photosynthesis will only take place in the presence of chlorophyll. All plants need light in order to photosynthesise (this is proven in many times in experiments) and so without light the plant would die. The light intensity affects the rate of photosynthesis is because as light, falls on the chloroplasts in each leaf and is trapped by the chlorophyll. This makes the energy available for chemical reactions in the plant. Which means as the amount of (sun)light (Light from the bulb) falls on the plant, more energy is absorbed, so more energy is available for the chemical reactions and so the quicker the rate of photosynthesis can occur. I have discovered that there are four ways in which the rate of Photosynthesis can change: 1. Light Intensity 2. Carbon Dioxide availability 3. Water availability 4. Temperature In our experiment we will use the amount of Oxygen produced because we can measure this easily and that it is a by-product of photosynthesis. ...read more.

Middle

We also used Sodium Hydrogen Carbonate, which is an irritant, and we should wear safety glasses. Fair Test To keep the test fair we had to keep the volume of the Sodium Hydrogen Carbonate and water the same. Also to keep the test fair we had to keep the time in front of the lamp at 10 seconds. We had to also keep the temperature the same as it affects the rate of photosynthesis and so the volume of oxygen produced. Finally to keep the test fair we had to keep the light colour the same because the chlorophyll absorbs different colours of light at different distances. Limitations We kept the tin of ten seconds because it would get us a sufficient volume of oxygen that could be measured accurately. Results Below are the distances that I had chosen to do and how much oxygen was produced in ten seconds. From these results I put my results into a graph Oxygen produced Against Distance Temperature Light Intensity Distance Concentration of NaHCO3 Oxygen made in 10 secs (mm3) (oC) (lux) (cm) (%) 1 2 3 Adv 20 100 10 2 82 82 82 82 20 70 20 2 58 58 58 58 20 50 30 2 41 41 41 41 20 34 40 2 28 28 28 28 20 23 50 2 20 20 20 20 20 ...read more.

Conclusion

The further away from the plant though it would not have mattered as much. * There could have been a slight difference from when the lamp was switched off and when the stopwatch reached ten seconds because our reaction times are not that quick and in the time that it took for the light to turn off a bubble could have been produced. * Heat generated by the lamp, which could change the temperature, which is one of the properties of photosynthesis. To combat this I could wait for the temperature after each experiment to cool back down to 20oC before I restarted. When there was 100% light intensity, the lamp was 10cm away the pondweed we found the quickest rate of photosynthesis because there was more light energy to use to do the reaction. When there was When there was 11% light intensity, the lamp was 70cm away the pondweed we found the slowest rate of photosynthesis because there was less light energy to use to do the reaction. There were no anomalies. I could have also done other experiments with the other properties that are known to affect the rate of photosynthesis such as carbon dioxide availability, water availability and Temperature. We could have also changed the light colour and the light bulb such as Florissant tubing. ...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. How temperature affects the rate of photosynthesis.

    was kept can be used in the test tube to immerse the elodea during the experiment. This would make the elodea adjust to the water environment by making conditions suitable for it to survive. The elodea will also acclimatise to the temperature of the water and will not have to reacclimatise if the surrounding water in unchanged.

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

    C-4 plants evolved in the tropics and are adapted to higher temperatures than are the C-3 plants found at higher latitudes. Common C-4 plants include crabgrass, corn, and sugar cane. Note that OAA and Malic Acid also have functions in other processes, thus the chemicals would have been present in

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

    The more water there is in the soil the greater the rate of osmosis will be. Chalk grasslands however are very porous and contain little water. The amount of water is dependent on the depth of the soil layer (on top of the bedrock).

  2. Absorption Spectrum of Chlorophyll.

    One drop of the chlorophyll extract was applied at the center of the line using a micropipette. Approximately 5 ml of eluent (both chloroform and ethanol were tested as eluents) was placed inside a 100 ml measuring cylinder, and the end of the chromatographic paper strip was dipped inside the

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