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

Biology Lab Report. Does light intensity affect the rate of photosynthesis?

Extracts from this document...

Introduction

Title To investigate the effect of light intensity on the rate of photosynthesis Research question: Does light intensity affect the rate of photosynthesis? Hypothesis: Theoretically plants need light to undergo photosynthesis. At low light intensities, there is a shortage of the product of the light-dependent reactions. There fore if the light intensity is low, the rate of reaction will also be low. The hypothesis is that the rate of photosynthesis increases with the increasing light intensity and decrease with the decreasing light intensity. Variables: Independent : distance between the source of light and the pond weed Dependent : time taken for the color of sodium bicarbonate solution to turn from deep red to purple Constant : the apparatus settings, the volume of sodium bicarbonate Solution (5 cc), the length of pond weed (5 cm) ...read more.

Middle

2 G 70 0 Data Processing Rate of photosynthesis can be calculated using formula as below: Number of bubbles released 20 minutes test tube distance from light source, cm rate of photosynthesis, no of bubble/ min A 10 4.5 B 20 1.9 C 30 1.1 D 40 0.8 E 50 0.3 F 60 0.1 G 70 0 Using the information from the table above, we can plot a graph of rate of photosynthesis against light. (see attachment) Conclusion The rate of photosynthesis is directly proportional to light intensity Evaluation: From doing this experiment, some flaws that have altered the experiments result has been detected. 1. The length of the pondweed is insufficient. ...read more.

Conclusion

The amount of oxygen released will alternately increased therefore the experiments results will be much faster and the data can be taken in time 2. The time for doing the experiment should be increased so that there is enough time for the weed to released enough oxygen that will turn the indicator from deep red to purple. 3. The volume of the indicator should be decreased so that the colour changes of the indicator will be faster. The concentration of the indicator should also be reduced so that the colour changes would be faster due to the fact that the mole of the indicator is lesser than usual 4. The experiment should be done in a very dark place where there are no source of light because the present of other light source will alter the experiment's results ...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

Here's what a teacher thought of this essay

4 star(s)

The experimenter gave sufficient detail on how they would investigate the effect of light intensity on the rate of photosynthesis. How variables were to be controlled or manipulated was described, however, the need to control temperature was left out. It might also be important to identify safety issues that might be taken into consideration. Rating ****

Marked by teacher Agnes Mupandiraa 01/12/2012

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. Marked by a teacher

    Investigation to find out how light intensity effects the rate of photosynthesis

    4 star(s)

    The formation of oxygen during photosynthesis is of great importance to all living organisms. All living organisms, including plants, carry out respiration, and most of that respiration is aerobic (using oxygen). Photosynthesis is the only way in which oxygen used in respiration is replaced in the air.

  2. Marked by a teacher

    An investigation into the abundance of fresh water black fly larvae, Simuliidae, between pools ...

    4 star(s)

    In pools the slow current means a large deposition of silt, the silt can settle in the still water and coat the bottom of the pool, with a layer of silt on the bottom of the pool the black fly larvae, Simuliidae, cannot attach itself to a stone.

  1. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    10 25 50 75 100 0 10 25 50 75 100 Sarah 16 3 0 0 0 0 29 11 0 0 0 0 37 29 5 0 0 0 43 33 32 0 0 0 Natalie 26 9 10 0 0 0 35 16 43 11 0 0 45

  2. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of ...

    5 star(s)

    * Black Tape- to secure the light and humidity probes. First of all, a large number of woodlice will need to be collected which are both roughly the same size and of the same species. Place these in the long-term culture container.

  1. Investigation into the relationship between the density of fresh water shrimps in fleet brook ...

    This is the only applicable method of testing the oxygen content of the water in the stream. It is also the most accurate method that could be used. The dissolved oxygen concentration of the water will have to be tested on site rather than on samples taken back to the laboratory.

  2. Ivy Plants.

    I know this as the sun tilts towards the sun like this: This can show why the petiole lengths are longer as they need to grow longer so that their leaves can reach the sunlight to photosynthesise. This agrees with my prediction as I said that the south side plants would be smaller than the north side plants.

  1. Find out what insulator is the best from cotton wool, bubble wrap and plastic ...

    5 13 18.5 A line graph to show average temperature lost every minute for different insulators Conclusion: From looking at my graph and results table I conclude that there is a change at the rate at which the heat transfers through the plastic foam.

  2. Find out how the amount of light, that is light intensity, affects the rate ...

    I will use a spatula to use the sodium hydrogencarbonate on the spatula using an equal amount for a fair test. I will need the boiling tube to hold the Elodea crispa in that so I can carry out the experiment.

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