For the preliminary results the results will not be taken in such depth, it will only be 5 cm to 30, light intensity, the temperature and amount of bubbles. These are the only factors which will come into play.
To do this experiment we will use the following equipment; lamp with 60w bulb, a meter rule, paper clip, test tube, sodium hydrogen carbonate, 12cm elodea plant and 60mm of water.
The experiment will be set up in the following way;
In this experiment there are variable which need to be considered. These are things that will be changed and may effect the experiment. I will keep the following variables the same through out my experiment to make it a fair test ; the amount of water used, the freshness of the pond weed, the amount of sodium hydrogen carbonate but also there are variable which we are unable to control as in the way the water heats up as the experiment goes on due to it being next to a hot lamp.
To do this experiment I found out some information about photosynthesis and the Canadian pond weed elodea. Here are two examples of the pond weed elodea, firstly in its natural sounding a pond;
The next example is of the pond weed when taken out of its natural surroundings and presented on a slab;
Here is the formula for photosynthesis;
Carbon Dioxide + Water → sugar + oxygen
6C0 H O C H O 6O
I have found some research and presented the relative information by a report by Vim Vermass.
Photosynthesis, which is the process that converts energy in sunlight to chemical forms of energy that can be used by biological systems. Photosynthesis is carried out by many different organisms, ranging from plants to bacteria. All these organisms convert CO2 (carbon dioxide) to organic material by reducing this gas to carbohydrates in a rather complex set of reactions. Energy for this process is provided by light, which is absorbed by pigments (primarily chlorophylls and carotenoids). Chlorophylls absorb blue and red light and carotenoids absorb blue-green light ,but green and yellow light are not effectively absorbed by photosynthetic pigments in plants; therefore, light of these colors is either reflected by leaves or passes through the leaves. This is why plants are green. Other photosynthetic organisms, such as cyanobacteria (formerly known as blue-green algae) and red algae, have additional pigments called phycobilins that are red or blue and that absorb the colors of visible light that are not effectively absorbed by chlorophyll and carotenoids. Yet other organisms, such as the purple and green bacteria (which, by the way, look fairly brown under many growth conditions), contain bacteriochlorophyll that absorbs in the infrared, in addition to in the blue part of the spectrum.
We carried out this experiment by first taking the light intensity at intervals of 5cm from 5 – 100 down the 100cm rule. Before the temperature was taken the temperature of the water starting an the room were taken. Theese were then reorded. The first test was then taken, first we allowed the wwed and water to climatise for 30 seconds then we again recorded the temperature, now we took a count of the bubbles which left the end of the stalk for a time period of 30s this was then recorded. For our preliminary results we only took mesuresments from 5 – 30 and didn’t take the temperatures because we were only trieng to get a rough I dea but for the proper exepriemant everthink was recorded and the procedure was carried out from 5 to 100cm.
Here are the results for the prelimary test;
From these you can see that there are many anoilies in the results and that where ever you start from normally produce the most bubbles but there is a variable to consider the first set from 30 – 5 were taken with an old pond weed and the second rom 5 – 30 were taken with a fresh one. The size of the bubbles which left the stem were quite large 2/3 mm in diameter and because of it only being preliminary a lot of the proper measurements and factors were not used.
Here are the results from the proper exerpiment a fresh pond weed was used and every result possible was recorded and temperature of water was recoreded alond with the room temperature;
From this we can draw many conclusions and present them in graphs asin the following;
