makes me uncertain of how accurate my results are and therefore causes
me to think that the results that I have obtained are not exact enough
to prove my hypothesis.
It could also be due to light
coming from other sources to our experiment causing the rate of
photosynthesis to rise with the light coming in though I do not know
however how this could have happened in all 3 experiments.
6CO + 6H O ® C H O + 12O (in the presence of light energy and chlorophyll) Aim- The aim of the experiment is to determine what effect light intensity has upon the rate of photosynthesis of Canadian Pondweed (Elodea)....
For further results, we could have tested how temperature affected the
plants along with testing how carbon dioxide levels affected
Below is a line graph of my average results:
This line graph also shows how the rate of photosynthesis rises after
45cm, If we had not done further research into this we would have
found it very unlikely that these results are anomalies because each
time we did the 3 experiments the same pattern has occurred, this
could be down to coincidence but the same pattern occurring 3 times
would be very unlikely.
After further research we realised that
all results that we have taken after 45cm must be invalid because we
know that the rate of photosynthesis should not rise again after 45cm
and should only carry on falling.
Prediction : I predict that as I increase the distance between the light source and the Canadian Pondweed (reducing the light intensity), the volume of oxygen produced within the time limit (the measure of the rate of photosynthesis) will decrease.
The upturn at the end of the graph
shows that after the light gets past 45cm (part with the arrow
pointing to it) the rate of photosynthesis starts to rise again.
Hypothesis:Photosynthesis is a process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose....
During the process of photosynthesis, carbon dioxide plus water in the presence of sunlight, enzymes and chlorophyll produce glucose and oxygen as waste product.
Prediction: I predict that as the light source (desk lamp) is moved closer to the pondweed (Elodea), the rate of photosynthesis will increase therefore more oxygen will be produced creating more bubbles.
It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .
Light is a very important factor in the rate of photosynthesis, in my project I am going to test that plants do need light in order to photosynthesise.
Another thing that I have to make sure is
the same throughout the experiment is the water temperature, I will do
this by putting the boiling tube with the elodea in it into a beaker
also filled with water, the outer layer of water would soak up and
excess heat energy coming from out light source, as mentioned above.
I think this
because I already know that a plant needs sunlight to be able to
perform photosynthesis as shown in the formula below:
Water + Carbon dioxide>> Sunlight>> chlorophyll>> Glucose + oxygen
Also I know that if you increase anything on the left-hand side of
this formula (the part I have boxed on the diagram above), everything
on the right hand side will increase (Increase of input = increase of
output.)This means that if the concentration of light were to be
increased, the levels of glucose and oxygen (The rate of
photosynthesis) will increase.