Leaf Disc Experiment

Topics: Photosynthesis, Eucalyptus, Carbon dioxide Pages: 4 (1106 words) Published: August 25, 2013
Background theory
Photosynthesis is a process of converting light energy (trapped by chlorophyll) to chemical energy, and stores it in bonds of sugar. Photosynthesis occurs in two stages; the light (light dependant) stage and the dark (light independent) stage. The light energy is used to split water molecules, and all the colours of while light are absorbed by pigments in the chloroplasts (chlorophyll-containing plastid found in algal and green plant cell). The breakup of water releases oxygen electrons, and protons: Electrons move to the chlorophyll (green pigment) while protons are stored in the chloroplast and the oxygen is used for aerobic respiration for the plant or ejected into the atmosphere. The high speed electrons and the stored protons combine with CO2 to form glucose. 6H2O + 6CO2 C6H12O6 + 6H2O + 6O2

(Water + Carbon Dioxide Glucose + Water + Oxygen)

Photosynthesis takes place predominately in plant leaves; rarely in plant stems. The cells in these leafs store cyclical energy in the form of adenosine triphosphate (ATP) molecules by breaking the energy bonds to release glucose. This glucose is used as fuel for performing cellular processes, and Eucalypt trees even produce their own food through photosynthesis, by using energy trapped to use for its own life processes. Throughout this experiment, the buoyancy of the leaves was the main indicator. At first, the leaves in the syringe floated, as they were already carrying oxygen from photosynthesising in a natural environment. The syringe acted as a plunge to remove excess oxygen causing leaves to sink. Sodium bicarbonate will replace the naturally occurring carbonate ions for the purpose of the experiment. This speeds up the reaction and release of carbon dioxide gas. 10 discs of each sample of eucalyptus will be placed in different concentrations of sodium bicarbonate, and placed under an energy source which in this situation is a projector light, making it a light dependant...

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* Measuring the Rate of Photosynthesis with the Floating. 2013. Measuring the Rate of Photosynthesis with the Floating. [ONLINE] Available at: http://www.elbiology.com/labtools/Leafdisk.html. [Accessed 13 February 2013].
* What is Photosynthesis?. 2013. What is Photosynthesis?. [ONLINE] Available at: http://photoscience.la.asu.edu/photosyn/education/learn.html. [Accessed 13 February 2013].
* PHOTOSYNTHESIS. 2013. PHOTOSYNTHESIS. [ONLINE] Available at:http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookps.html. [Accessed 13 February 2013].
* Measuring the rate of photosynthesis - Science & Plants for Schools. 2013.Measuring the rate of photosynthesis - Science & Plants for Schools. [ONLINE] Available at: http://www.saps.org.uk/secondary/teaching-resources/157. [Accessed 17 February 2013].
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