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

Investigation of Photosynthesis in Pond weed

Extracts from this document...

Introduction

Investigation of Photosynthesis in Pond weed Prediction: I predict that the closer the lamp is to the plant the photosynthesis will be greater. Hypothesis: My prediction is based upon the fact that the closer the lamp is to the plant, the more light will get to it, so more of the plants surface area will be in contact with the light. If this is so, the plant will produce more glucose and oxygen. Photosynthesis is where a plant respires. A plant will take in light, water and carbon dioxide and produces glucose and oxygen. The glucose is used by the plant as food and the oxygen is put back into the environment. So, photo synthesis is very important in the environment otherwise there would be no way of recycling the carbon dioxide waste product from animals back into the useable gas of oxygen. ...read more.

Middle

100 ml graduated cylinder to put the pond weed in 2. 300 ml beaker to put the graduated cylinder in 3. Desk lamp 4. Metre ruler 5. A sufficient amount of pond weed to carry out the experiment 6. Stop clock Method: Put a pondweed plant in a beaker of water 250ml full. Put the plant in an inverted measuring cylinder full of water and place it in the beaker of water. Put the lamp at set distance from the beaker with the heat shield between them. Record the oxygen created by the pondweed at 30 second intervals for 2 1/2 minutes. Results Tables The units recorded below are in centimeters cubed (cm3) RESULT SET 1 0 5 10 15 20 25 30 0 0 0 0 0 0 0 0 30 0.4 0.3 0.2 0.1 0.1 0 0 60 0.7 0.5 0.4 0.2 0.1 0 0 90 1.0 0.8 0.5 0.3 ...read more.

Conclusion

In the experiment a trend can be noticed in the results of the oxygen produced. As the distance from the lamp increases, in intervals of 5 cm, a decrease of approximately 0.1cm3 of oxygen is noticed between each interval. It is apparent from the experimental results that the light, of the intensity used, becomes significantly deficient at 30 cm distance, as evidenced by the cessation of generation of oxygen over the experimental time of 2 1/2 minutes. This proves that my original predication was correct. If more of the plants surface area is in contact with the light then the more glucose and oxygen will be created. Evaluation: The experiment is a good example of how the distance between a plant and light can make a difference to photosynthesis. Possibly changing another variable such as temperature could affect the results to find out more. It would possibly make a difference if there was an unlimited supply of carbon dioxide and water. ...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. An Investigation into Species Diversity with distance along a Pingo.

    The greatest species diversity will be where the soil is the most alkaline, for the species will have adapted to suit the alkalinity and thus grow best in those conditions. In taking into account the adaptations mentioned above I predict that xerophytic plants will be present where there is a shortage of water.

  2. Photosyntesis in a Pond Weed.

    The same person will be counting the bubbles, time, temperature and amount of sodium hydrogen carbonate each time to make it fair. Prediction: I predict that the closer the beaker is to the light the more bubbles will appear, this is because the closer it is the more light can be absorbed by the plant causing more photosynthesis to happen.

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