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

Photosynthesis " Limiting Factor

Extracts from this document...

Introduction

Photosynthesis - Limiting Factor (Light Wavelength) Nick Gourlay Purpose The purpose of this experiment is to design a procedure to determine how much the rate of photosynthesis varies when different colours from the visible light spectrum are used as the light source. Hypothesis As the light colours change from darker to lighter colours (for example from blue to white), the rate of photosynthesis will vary, in that it will not show any change in the middle of the colour spectrum (since green is reflected by chlorophyll), but will with the rest of the colours (white, red, and blue) because chlorophyll absorbs all colours and reflects green. Materials - Elodea (water plant) - Graduated cylinders - Test tubes - Water - Thermometer - Lamp - Light filters Experimental Design The design of this experiment is one which allows us to observe the rate of photosynthesis as it is exposed to different colours of light. For photosynthesis to occur the presence of light is needed, (white light permits plants to absorb all colours of the spectrum except for green, which is reflected). ...read more.

Middle

Some wavelengths do not have a concurrent pigment in the plant and thus would not cause any change in the photosynthesis process. However our experiment showed us that the elodea could absorb all the wavelengths of light, something we know not to be true. The filters are a possible source of error, if repeated higher quality filters should be used as well as a better method to shine the light upon the plant. Photosynthesis - Limiting Factor (Temperature) Nick Gourlay Purpose The purpose of this experiment is to design a procedure to determine how much the rate of photosynthesis varies when the plant is in different conditions. In this experiment the varying condition will be temperature. Hypothesis High temperatures will denature enzyme activity; a big increase in temperature will stop photosynthesis. Accordingly, low temperatures will slow down photosynthesis as well, by enabling the plant to gather energy from light and excite its electrons. Therefore, in order for photosynthesis to work, the temperature must not exceed a temperature maximum or minimum. ...read more.

Conclusion

Evaluation Our results show that temperature has little or no effect on the rate of photosynthesis, however we know that this cannot be true as we understand that temperature would have an effect upon the rate of photosynthesis. Enzyme activity is required for the process of photosynthesis to occur. We know that enzyme activity is directly related to temperature of the surroundings. The effectiveness of enzyme activity increases with an increase of temperature. We also understand that once a certain temperature is reached the enzyme will denature and cause a slowing of the process of photosynthesis. No bubbles would be expected from the boiling water or the ice water as the enzymes will have become denatured and the process will have stopped. However the lack of air bubbles at the room temperature elodea caused surprise. This showed that there was clearly a flaw in experimental design and results. It is hard to predict what the exact cause for the problem was however it could be due to the method of lighting, or damage to the plant or another substance being present in the water. If repeating the experiment these are areas that should certainly be improved upon. ...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

    Set of calorimeter 1 Standard size Nil 12. Weight balance 1 Standard size +0.001 g Table 2: The table above shows the apparatus used during the conduct of the experiment Material: (1ml = 1g of substance) No. Material Quantity Volume/Size Uncertainties 1. Fresh green leaves (Mustard and spinach)

  2. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    than the bean plant, greater by 10mm approximately - Sunflower plants have 2 to 3 leaves - Size of leaves are small - Presence of 2 leaves on each plant - Plant and leaves are green - Sunflower plants have a greater height than the bean plant, greater by 10mm

  1. Lab on Photosynthesis

    The Elodea plant was cut into 5 equal pieces 2. Each piece of Elodea was placed in a beaker that had been filled with water (there were 5 500ml beakers each with water and Elodea) 3. The 10 test tubes were each filled with water 4.

  2. 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.

  1. 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.

  2. design photosynthesis

    As a result, the rate of photosynthesis will increase gradually. When it reaches maximum point, the process will be constant. Variables a) Independent variables : distance of table lamp from the leaves (light intensity) The light intensity (L) is controlled by placing the source of light which is the lamp, to the ananas comosus leaf disc at different distances,D.

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

    Dependent Variable: Volume of oxygen(mm3) evolved, calculated from the length of oxygen bubbles in apparatus Control Variables Potential Effect on D.V. How will I control it Light Intensity Photosynthetic activity increases as light intensity increases. This happens because light intensity is essential for the production of ATP and NADPH, which

  2. 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.

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