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

design photosynthesis

Extracts from this document...

Introduction

TITLE : factors affecting rate of photosynthesis Research question : What is the effect of light intensity on the rate of photosynthesis in Ananas Comosus leaf disc? Introduction: Photosynthesis is a chemical process whereby light energy is used to convert raw materials; water, carbon dioxide, to organic substances such as glucose and oxygen. Water vapour is also released to surrounding as waste product. Photosynthesis can be summarized as following: Carbon dioxide + water �� Glucose + Oxygen However, the rate of photosynthesis can be higher or lower depending on the factors that affect them; light intensity, temperature, concentration of carbon dioxide. This process occurs in chloroplast because it contains abundant green pigments called chlorophyll. These pigments are found to be in any parts of the plants that is green, including the leaves. Light intensity is one of the factors that largely affect photosynthesis because it is used to supply photons to the chlorophyll. When it reaches photosystems in chlorophyll, more electrons are excited and released to start off the process of photosynthesis. As a result, the rate of photosynthesis will increase gradually. ...read more.

Middle

4. 2 cm3 or the 20 cm3 sodium hydrogen carbonate inside the beaker is measured and poured into the same syringe. 5. The airs inside the syringe is pushed out and then, pull the syringe's plunger upwards while its nozzle is closed using a thumb. 6. All the leaf disks and sodium hydrogen carbonate solution inside the syringe is poured back into the beaker. 7. The content of the syringe is then poured into a beaker. The leaf discs are made to a single layer, rather than they are on top of one another. 8. The bulb is switched on and stopwatch is started immediately 9. The time taken by each leaf disc to float on the surface of sodium hydrogen carbonate solution is measured using stopwatch. 10. The experiment is required to be repeated with varying light intensity 11. All data are recorded and presented as below. Data Collection a) Qualitative Data 1. Air bubbles are produced from the leaf disks when the syringe's plunger is pulled outwards. 2. All of the leaf disks sink under the water when they are immersed in the sodium hydrogen carbonate solution initially. ...read more.

Conclusion

Ananas Comosus leaf has scattered distribution of chlorophylls while most of the chlorophylls is located at the under part and the rest at the upper part. Leaf disks are immersed in different orientation. Some of them are in upright position while the others are upside down. Thus, the rate of photosynthesis differs from one leaf to the other. All of the leaf disks immersed in the sodium hydrogen carbonate solution should have only one same orientation. In this case, we need to ensure that all of the lower parts of the discs face upward. Evaluation Conclusion When leaf discs are immersed in a sodium hydrogen carbonate solution (a source of carbon dioxide) and illuminated, the oxygen produced by photosynthesis causes the leaves to float. The time the leaves take to float can thus be used as an indirect measure of the rate of photosynthesis i.e. the more quickly flotation occurs, the faster the rate of photosynthesis. However this is true only until a certain point is reached. After the point is reached, the rate of photosynthesis will no longer increase but rather decrease. This is because there are other factors such as the denaturation of enzymes or cells. ...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 - 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. Testing the effect of characteristics of leaves on the transpiration rate of * ...

    For example, five small leaves and five big leaves have certainly different surface area. Hypothesis All four different species of plant *Rubiaceae, Verbenaceae, Oleaceae, and Rutaceae would transpire at the different rates from each other. Even though having the same surface area, each has its own characteristics of leaves, and therefore the transpiration rate would be various.

  1. 8.2 - Photosynthesis

    Photosystem 1 does not generate any NADPH + H+, but acts to send electrons to the proton pump. Photosystem 1 is oxidised, releasing an excited an electron to reduce the membrane proton pump. Protons, in the forms of H+ are pumped into the thylakoid space.

  2. The effect of pvc piping on the breathing/heart rates of male year 12 students

    induced breathing to insure that the heart has time to react to different oxygen intake conditions. Temperature Controlled variable Temperature can affect heart rates, in colder conditions the heart beats faster to aid in warming the body for instance. Temperature will be kept constant at 24C 1.2.2 Control experiment- Subjects

  1. Plan for an experiment - How does temperature affect the rate of photosynthesis?

    My hypothesis for this experiment is therefore that as temperature increases, the volume of oxygen that?s produced by the plant will also increase, as more successful collisions are taking place, with temperatures between 20 - 30C producing the largest amounts of oxygen.

  2. Examine the correlation between soil moisture at different heights up the slope and the ...

    on my final result as well as allowing us to determine whether there is a significant difference in slope angle at every Bracken Fern being recorded and therefore allowing us to work out whether it affects the correlation between soil moisture and the longest leaf.

  1. What is photosynthesis?

    The main site of photosynthesis in all the photosynthetic organisms is specifically chloroplasts. The chloroplast has two membranes one being the outer and the other being the inner one with an inner membrane space between these two. The sugars are made in a compartment of thick fluid enclosed by the inner membrane, called the stroma.

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

    In the other two test tubes, place 1 ml of aerated water. Mark these as test tubes 3 and 4.. 6. Place test tubes 1 and 2 in the test rack. 7. Place aluminum foil the sides of the test tubes 2 and 4.

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