• 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. Ecology Open Investigation Does the geographic location affect the biotic and abiotic ...

    Brown Lake was tested first then 18 Mile Swamp. 18 Mile Swamp was tested at noon and consequently the sun is hottest at this time. Therefore this will affect the results for the warmth of the water can affect several factors such as temperature and oxygen levels Before carrying out

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

    - Volume of water uptake Volume = ? r 2 h = ? � (0.05)2 � (0.7) = 0.0055 cm3 r (radius of capillary tube) = 0.5 mm = 0.05 cm h = (mean of) distance of water uptake - Volume of water uptake per minute per m2 Volume of water uptake per minute per m2 = volume

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

    - Comparison of the beats per minute of the hearts of male students age 16-17 trough different lengths of PVC piping. Regular breathing 25cm 50cm 75cm 100cm Average Beats per minute +1 76 80 85 96 115 Standard deviation +1 8 8 19 9 10 2.3.1- Processed data table 2 (table 7)

  2. Reaction Time

    The hypothesis will then be: "People who carry out sports should have a faster reaction time than those who do not". This is based on the previously named investigations that have been made concluding the same result as this hypothesis.

  1. Lab on Photosynthesis

    1 gram of each NaHCO3 solution was weighed out (0.1%, 0.2%, 0.3%, 0.4%) 5. These varying solutions of NaHCO3 were placed in 4 test tubes of water (while one just contained water) and these 5 test tubes were labelled 6.

  2. Importance of Photosynthesis

    Therefore if photosynthesis didn't take place, humans and animals would not have food to eat. [1] There are many different types of energy in the world. These are classed into two groups: renewable and non-renewable energy. Renewable energy can be used as a fuel and these types of energy can be used over and over again.

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

    To prevent this, I will put a large beaker of water in between the apparatus and the bulb. I?m using water because it has a high specific heat capacity, which means it would absorb the heat energy produced by the bulb without adversely affecting my experiment.

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

    * knife/Scissors * ruler * 2 pieces of aluminum foil (to cover the sides of test tubes) PROCEDURES 1. Obtain 4 sprigs of elodea in 12 cm long pieces. 2. Place one plant against one glass stirring rod. Attach each end to the stirring rod by placing a rubber band on each end.

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