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

Photosynthesis and Light intensity

Extracts from this document...

Introduction

PLANNING A Aim: The aim of this experiment is to investigate the effect of different light intensities on the rate of photosynthesis Theory & Hypothesis: The photosynthesis rate is often measured by the amount of carbon dioxide absorbed or oxygen evolved by a plant. With increase in light intensity, photosynthesis begins, and some carbon dioxide from respiration is utilized in photosynthesis. As light intensity increases, there is an increase in the rate of photosynthesis, and this light intensity can be increased or decreased by bringing the source of light closer to or further away from the plant. Hypothesis: Hence, we can predict that with increase in light intensity, the rate of photosynthesis would also increase. Variables: The variables in the experiment are light intensity and the rate of photosynthesis. ...read more.

Middle

8. Ruler 9. Stop-watch Procedure: 1. Place the hydrilla in a test-tube filled with dilute sodium hydrogen carbonate solution 2. Fix the test-tube on the retort stand 3. Placed the lamp at a distance of about 5cm from the test-tube 4. Start the stop-watch 5. Start counting the number of bubbles produced 6. Note the number of bubbles produced after 2 minutes in a table 7. Repeat the above steps with the lamp at distances of 10cm, 15cm, 20cm and 25cm Data Collection (Observation): No. Distance between lamp and plant/cm No. of bubbles/2 minutes 1 5 150 2 10 124 3 15 103 4 20 90 5 25 55 Discussion: Thsu the above observations are according to our hypothesis. ...read more.

Conclusion

Thus at a close intensity of 5 cm, maximum number of bubbles is formed, and at the least intensity of 25 cm, least number of bubbles is formed. Modification: 1. Use other types of plants. 2. Conduct the experiment various times ,in order to ensure accurate results. Precaution 1. Start counting time only from the first bubble. 2. Ensure that the light intensity is not too high, because otherwise the hydrilla may die Limitation: 1. The experiment was carried out once, and thus the result may be inaccurate Conclusion: Hence, we can conclude that light intensity is directly proportional to the rate of photosynthesis, and greater light intensity produces more bubbles. ...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. Experiment Colours of Light (Wavelength) absorbed by green plant

    E.g: The calculation of the average percentage of absorbance of wavelength (nm) for the mustard sample exposed at 440nm (With respect to standard solution at 0.00nm) in different trials is given below = [2.00+2.00+2.00]/3 = 2.00 Hence, Wavelength (nm) Average percentage of absorbance of wavelength by mustard sample (With respect to standard solution at 0.00 absorbance)

  2. Extended Essay- How is production of carbon dioxide (CO2) during digestion affected by the ...

    5This information was found in Stedman's Medical Dictionary published in 2006. This information can also be found in the national library of medicine The Rapunzel Rize yeast is organic active dry yeast that is processed without any chemicals and is GMO-free.6 Splenda contains dextrose, maltodextrin, and sucralose.

  1. affect of light intensity on rate of photosynthesis

    This keeps the concentration of NaHCO3 (which supplies CO2) constant; therefore increase accuracy of the result. If NaHCO3 was put in different amount into each beaker, the measure of pH change will be different. * The solution in each beaker was tested for pH before the experiment to ensure they

  2. Experiment - Influencing the Rate of Photosynthesis with Light Intensity and Carbon Dioxide Concentration

    Variables and Controls Independent Variable: distance of light to change light intensity, amount of sodium bicarbonate to increase the carbon dioxide concentration Dependent Variable: number of bubbles produced Constant Variables: * Temperature of water inside test tube (room temperature: 16-20 �C )

  1. Experiment. The dependence of the rate of photosynthesis on light intensity

    For photosynthesis, coming with the release of oxygen, in one way or another is suitable any visible light from violet to medium red. During photosynthesis with the help of light happens the process of water splitting, where oxygen is liberated and energy-rich forms compound.

  2. 8.2 - Photosynthesis

    The co-enzyme NADP+ is reduced to form NADPH + H+. The first photosystem, photosystem two [PS2] is able to absorb light of the wavelength 680nm, which is why it is called P680. The second photosystem, photosystem one [PS1] is activated by wavelengths of 700nm, and called P700.

  1. What is photosynthesis?

    Chloroplasts have several kinds of pigments, such as Chlorophyll a, Chlorophyll b, and caretenoids. Chlorophyll a consumes mostly blue-violet and red light and reflects green. Chlorophyll b consumes mostly blue and orange light, in turn reflecting yellow-green. As to caretenoids, they consume blue-green light and appear as yellow-orange.

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

    Elodea is a common water plant used in aquariums and for certain biological studies. Candidate's number 002094- 023 Aleksandra Katarzyna Rosiczka ________________________________________________________________ RESEARCH QUESTION How does controlled light intensity and sodium affect the rate of increase in the excess of oxygen created by the elodea plant undergoing photosynthesis?

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