• 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

    Extraction of both plants produce green colour. Since the cell membrane of the plant is absence after they have being boiled with boiled water, the chloroplast are removed easier.

  2. affect of light intensity on rate of photosynthesis

    * Distilled water was used because it contains no unknown substances that might affect the experiment * All same size beakers so all plants can have the same environment * The plants were taken from the same mother plan.

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

    Sodium bicarbonate was added to increase the carbon dioxide concentration and the bubbles produced were counted. Materials and Methods: Materials: 1 sprig of Elodea 1 test tube 15 ml of room temperature water 2 grams of Sodium Bicarbonate powder Lamp with 40 watts Sharp Scissors Metric ruler (cm)

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

    Dextrose is also known as glucose.7 Maltodextrin is an easily digestible carbohydrate made from natural cornstarch and it is also a polymer of dextrose.8 "Sucralose is a molecule of sugar chemically altered to yield three hydroxyl groups and replace them with three chlorine atoms.

  1. 8.2 - Photosynthesis

    Light is first absorbed by the chlorophyll A in PS2. This energy is then converted into chemical energy by releasing electrons in oxidation. The electrons from PS2 then pass along the thylakoid membrane in a series of redox reactions. The protein pumps are reduced to pump H+ ions into the thylakoid space.

  2. Carrot growth with differing wavelegnths of light

    ATP synthase lets the protons cross the membrane by going down the proton gradient and uses the energy to synthesize ATP (Allot 2007). Remember, that entire process is dependent on the amount of light energy absorbed. Research Question: How does the wavelength of light affect the growth of Daucus carota?

  1. What is photosynthesis?

    In the stroma, the interconnected membranous sacs called the thylakoids, contain a third chloroplast compartment, called the grana, which are located in such a way that maximizes the absorption of sunlight. The molecules that absorb light in the thylakoid membrane are called pigments.

  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