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

Laboratory work on a theme The dependence of the rate of photosynthesis on light intensity

Extracts from this document...

Introduction

Vahrusheva Djulya 10ib Laboratory work on a theme "The dependence of the rate of photosynthesis on light intensity" Introduction Photosynthesis is a process of converting light energy to chemical energy. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis. I had to test one of two reactions of photosynthesis: the light reaction because only it used the light reaction. The main chemical reaction involved in photosynthesis is: 6CO2+6H2O (+light energy) � C6H12O6+6O2 I controlled all these conditions and made my own experiment, which proved that the light reaction really needs light to produce O2. Aim Determine intensity of photosynthesis on allocation of ?2, depending on the light exposure. ...read more.

Middle

Make 24 circles from leaf uses punch and infiltrate them by water saturated with CO2 2) Infiltrated circles put for six pieces in cups with water, enriched with CO2. 3) One of the cups put in the darkness (control)... ...others put up for the light at different distances from the source and count the time RESULTS Circles float up at different time depending on the light as a result of accumulation in intercellular spaces of the oxygen formed during photosynthesis. I had spotted 45 minutes and then saw a result. Circles in the darkness haven't floated. The circles which were the nearest with the lamp (0 cm) ...read more.

Conclusion

Firstly, is that all conditions were unnatural and all was only a model how O2 is produced in environment. Secondly, I might do the concentrate of CO2 higher, than 0, 5%. Thirdly, lamp isn't a sun and I couldn't do all conditions in definite numbers. Fourthly, I had to tear off leaf of the Chlorophytum. Greenpeace doesn't like it. Fifthly, I had to use only leaf of Chlorophytum because leafs of other plants don't float. Despite of these weaknesses I think that I prove that the amount of emitted oxygen depends on the amount of light energy. It is a very simple experiment and a very effective. Suggestions for improving investigation In my view this experiment will be better if I do in natural conditions uses sun light. But perhaps there will be drawbacks with other conditions. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Penicillin - its discovery, properties and uses.

    Conclusion Penicillin had many advantages at the time of its discovery and remains an important drug today. Anyone able to associate a name with the development of penicillin almost invariably thinks of Alexander Fleming, all the praiseworthy achievement to develop penicillin have towards to Alexander Fleming.

  2. Testing the effect of characteristics of leaves on the transpiration rate of * ...

    faster than when they would be in the condition of day 2. With this, the comparison among plants is not reliable much. There are always human errors. This often involves incorrectly reading the capillary tube on potometer in this case.

  1. Experiment Colours of Light (Wavelength) absorbed by green plant

    The peak at 425 nm shows absorption of 2.40 % of absorption and another peak at 650 nm shows 1.50 % of absorption. Hence more wavelengths is absorbed than reflected by the photosynthetic pigments of spinach at point 425 nm and 650 nm.

  2. Should Animals have the same rights as Humans? Both animals and humans exhibit behaviours ...

    In his book Animal Liberation Peter Singer puts forward a utilitarian philosophy with regard to animal rights. This way of thinking was developed to enable people to come to a decision about right or wrong without the use of religious or moral authorities such as the bible.

  1. Lung Capacity Fitness Level

    and Spirometer [5] DATA COLLECTION AND PROCESSING Recording Raw Data Table 2.0: This table shows the number participants' number, their score that they received on the fitness level survey out of 32 and their respective fitness level (extremely low / low / medium / high / extremely high); the participants' age, weight (kg)

  2. Biology independent investigation, Ecology

    This is because the purpose of the fresh weight and dry weight is so they can be compared. However the mass of the dry seed before germination is unknown. The fresh weight is looking at the change in mass between the fresh seeds on different days, the dry mass however

  1. design photosynthesis

    b. Size of leaf disks i. Using cork borer, the size of leaf disks is kept constant with the value of 8 mm. c. Power of table lamp i. The power of light bulb is maintained to 100 watt along the experiment. d. Concentration and volume of sodium hydrogen carbonate solution i.

  2. Biology lab - testing the effects of light intensity on photosynthesis.

    Independent variables: intensity of light, baking soda Dependent variable: amount of elodea, temperature Controlled variable: amount of oxygen MATERIALS * 4 cut pieces of aquatic plant (Elodea) * 4 test tubes * distilled water (boiled and brought to room temperature)

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