Rate of Photosynthesis Experiments
The rate of
photosynthesis can be measured directly by the production of oxygen. This is most easily achieved using an aquatic
plant, such as Elodea. The oxygen can either be
collected and measured or the amount of bubbles produced can be counted.
Using the above
information devise a simple experiment to investigate the effect of either
on the rate of photosynthesis.
Make at least three
separate measurements and if time allows repeat any anomalous results. Record
your results and write a conclusion that you will present to the rest of the
class along with a summary handout of your findings.
Tips
Temperature – it is
easy to alter the temperature of the water. It is best to use a hot plate not a Bunsen.
Light intensity –
there are lamps that you can use to increase and decrease light intensity
Carbon dioxide – if you
can sodium bicarbonate to water the level of dissolved carbon dioxide increases.
Use only very small amonts,
no more that 0.5g per 1000cm3.