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

    the mention of sugar alcohol was quite frequent, and it is important to understand what it is. What are sugar Alcohols? Sugar alcohols are carbohydrates; part of their chemical structure resembles sugar, and part of it resembles alcohol. Examples of common sugar alcohols are maltitol, sorbitol, isomalt, and xylitol.

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

    Wavelength (nm, nanometer) Absorption (%) (+0.01) Standard Solution Mustard sample T1 T2 T3 440 0.00 2.00 2.00 2.00 470 0.00 1.33 2.00 2.00 490 0.00 0.75 1.95 2.00 520 0.00 -0.30 1.44 1.87 550 0.00 0.58 1.55 1.88 580 0.00 -0.29 1.81 2.00 590 0.00 1.34 2.00 2.00 680 0.00

  1. Lab on Photosynthesis

    10. An unlabeled (not containing a solution) test tube was placed inverted over the end of the funnel quickly so that all the water did not pour out 11. The light was turned on and the timer started for 10 minutes 12. Observations were made about how many bubbles rose and the amount recorded (2 people were needed because there were 2 beakers)

  2. design photosynthesis

    The light intensity is calculated as : L =1/D� Several distances were chosen: 10 cm, 15 cm,20 cm, 25 cm, 30 cm, 35 cm The distance of the lamp to the leaf is measured by using metre ruler. b) Dependent variables : time taken for the leaves to float The

  1. BIOLOGY PRACTICAL-yeast and gas production

    This increases the rate of reaction as now more substrate molecules bind with the free active site and are catalyzed. However, as the temperature further increases >60�C, the vibrations and the frequency of collisions increases, however the enzymes start to become denatured.

  2. Importance of Photosynthesis

    These fuels are called fossil fuels. As said by the name, this type of energy is derived from fossils. Fossils are dead animals or plants which have been preserved in the ground for millions of years. For this reason, plants are needed to create fossil fuels, which are used throughout the world by every country.

  1. 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 )

  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