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

An experiment to investigate the effect of light intensity on the rate of photosynthsis

Extracts from this document...


David Experiment: An experiment to investigate the effect of light intensity on the rate of photosynthsis. Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis. Introduction: Photosynthesis is the process that produces 'food' for plants, this 'food' is called glucose. The process takes place in the leaves of green plants, this is what the leaves are for. There are four things that are required by the plant before it can carry out photosynthesis, they are light, chlorophyll, carbon dioxide and water . Chlorophyll is the green substance found in chloroplasts and this is why leaves look green. The chlorophyll is very important because it makes the whole process occur. It absorbs the energy from the sunlight and uses it to combine CO2 and water to produce glucose. ...read more.


3. The guard cells, on the bottom layer, control the amount of gas movement in and out of the leaf. There is a formula that lets us know the rate of photosynthsis, it is: Carbon Dioxide + Water ? (sunlight +chlorophyll) ? Glucose + Oxygen. 6CO2 + 6H2O ? (sunlight + chlorophyll) ? C6H12O6 + 6O2. The rate of photosynthsis can be altered by three factors which are the amount of light, carbon dioxide and the temperature. The reason why the amount of light is important is because the chlorophyll uses light energy so it can only produce glucose as fast as it is receiving sunlight. Carbon dioxide is always in short supply because only 0.03% of it is in the air, so it is usually the limiting factor in the rate of photosynthsis. ...read more.


Also we made sure that the lamp was at the right distance from the plant to ensure that it can produce photosynthesis. Apparatus: In this experiment the apparatus we used was a meter ruler, lamp, stop watch, test tube, test tube rack, plant and sodium hyrocarbonate. Method: We first took a test tube and filled it with sodium hydrocarbonate and then placed the plant inside the tube. We then placed the test tube into the rack, then we slid the metre ruler under the rack allowing the test tube to be above 0cm. Next we placed the lamp beside the ruler at 5cm and switched it on making sure that the plant received direct light from the lamp. Then for 1 minute we counted the number of bubbles coming out of the stalk for three minutes. We repeated this exercise five more times, each time moving the lamp 5cm from the plant. ...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.

    it difficult to cut it to a high level of precision and to cut it at an angle sufficient enough to prevent any air bubbles to form. Therefore the elodea could not be cut to an exact length of 50mm and this influenced the reliability and the accuracy of the results in the experiment.

  2. An experiment to investigate the effect of Light intensity on the rate of photosynthesis.

    The total amount of gas given off was measured as the pipe containing the oxygen produced was next to a scale measured in millimetres. The total amount of gas given off was gave insufficient values of Oxygen to measure so I decided that next time, I would leave the plant

  1. Absorption Spectrum of Chlorophyll.

    nm and red absorbance maxima of (662 ? 3) nm (Table 1). Extract 1 was performed first, before increasing the frequency of measurements, and thus it has fewer data points. In order to accurately compare the spectra from separate extracts, it is necessary to normalize the absorbance values.

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

    I will take 5 measurements in total, ranging in 25cm intervals. These measurements/distances will be 0cm, 25cm, 50cm, 75cm & 100cm. I will take 1 repeat of each measurement/distance in order to gather whether the results are moderately similar, to conduct the fairest test possible.

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