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

Planning an experiment to find out if light intensity alters the rate of photosynthesis of a plant.

Extracts from this document...

Introduction

Planning an experiment to find out if light intensity alters the rate of photosynthesis of a plant Introduction In this experiment I am trying to find out if light intensity alters the rate of photosynthesis of a plant by using waterweed in different light intensities. I would have to consider rate-limiting factors such as the amount of carbon dioxide in the water. To make sure the carbon dioxide supply does not run out, sodium hydrogen carbonate could be added in the water. A temperature rise may cause photosynthesis to speed up, so in order for this experiment to be a fair test I would need to keep the water at a constant temperature from the beginning of the experiment. I would also need to know if the bubbles of gas produced by the plant is oxygen. ...read more.

Middle

Method I will measure the rate of photosynthesis in this experiment by using waterweed in a waterbath. The waterbath will be set up with approximately 5cm of sodium hydrogen carbonate solution that will help maintain a good supply of carbon dioxide. The water in the waterbath will have been left for a few days in the room the experiment will take place in, as it will therefore be at room temperature and will also be de-chlorinated, making this experiment a fair test by making sure it is at a constant temperature. A waterweed shoot of about 5-10 cm long will be selected. A paperclip will be slid over the tip of the shoot, which will then be dropped into the waterbath, acting as a weight so the shoot is held underwater. ...read more.

Conclusion

This will be repeated when the lamp is 30 cm away from the waterbath. Now, the bulb in the lamp will be changed to a 150-watt bulb and the experiment will be repeated in the same way so it is a fair test. It will start with a distance of 10cm with a jar over the waterweed to check if the gas given of by the plant is oxygen. Next, will be a distance of 20cm and then 30cm, as before, and each time the rate of bubble production will be noted. So that the results are accurate, the experiment will be repeated three times. So that, overall, the experiment will be fair, the same amount of water and sodium hydrogen carbonate and waterweeds of the same size will be used. For safety measures, we will ensure that the bulbs and the water do not come into contact. ...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.

    At a low temperature (0 oC) reactant molecules like the 6 carbon instable intermediate and triose phosphate possess a very low amount of kinetic energy. The reactants move around in the environment very slowly the probability of these molecules colliding isn't very great and if they do collide they do not have sufficient energy to break or form bonds i.e.

  2. Investigate the effect of light intensity on the rate of photosynthesis in an aquatic ...

    * Nip end of weed with nail, it is where the O2 will be seen from. * Set light source (lamp) at 0cm from pond weed in large beaker * Leave pond weed to adjust to first light intensity of the light source for a timed 2 minutes

  1. Investigation to show that changing light intensity alters the effect the rate of photosynthesis.

    Cut a piece from the elodea in the water. Than quickly transfer into the sodium bicarbonate solution. Before transferring add a paper clip and the weed should be upside down to allow the o2 bubbles to escape. After placing the weed in the solution, using a glass rod position it so the weed is by the gap and is upside down.

  2. To Find Out If Light Intensity Has an Effect On a Plants Rate of ...

    I have chosen to study the light reaction. Therefore, I will ensure that all the other variables are carefully monitored and kept the same, as this is crucial to a fair experiment. The graph above shows my prediction of what I believe will happen in my experiment. The point where it stops increasing is where another variable becomes the limiting factor.

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