The Affect of Wavelengths of Light on Rate of Photosynthesis
Record or report findings.
Rate of photosynthesis (measured by ET50, time it took for 50% of the leaf disks to float up)
Color of light (wavelength of light)
Light intensity, temperature, bicarbonate concentration (0.2%), depth of bicarbonate solution, direction of incoming light, pH, amount of soap, size of leaf disk, type of plant
Ten trials for each color, however for each trial, a few disks did not float up.
Light wavelength effect on the photosynthetic rate of ..
Red will have a very high photosynthetic rate
as even though it has the longest wavelength and therefore carries the
least energy it will be greatly absorbed so a lot of the light energy
will be used rater than reflected.
Green or yellow light will have the slowest rates of photosynthesis because they are reflected by the pigments in the plant.
DESCRIPTION & ANALYSIS
SOURCES OF ERROR AND IMPROVEMENTS
In this lab experiment, the team examines how the rate of photosynthesis is affected by different light colors in the leafs.
This is because plants also have different pigments
The color to have the least
photosynthetic rate will be green as although it has quiet a short
wavelength so a lot of energy it will be reflected by the plant and
These different pigments absorb different wavelengths due ..
I will measure the rate of photosynthesis by counting the number of bubbles that are released by the stem of the pond-weed when the lamp is shone on it from different distances.
Mimi Beer, Mary Duff, Ali Christopherson, Bingham
The action spectrum of photosynthesis is a graph showing the rate of photosynthesis for each wavelength of light. The rate of photosynthesis will not be the same for every wavelength of light. The rate of photosynthesis is the least with green-yellow light (525 nm-625 nm). Red-orange light (625nm-700nm) shows a good rate of photosynthesis however the best rate of photosynthesis is seen with violet-blue light (400nm-525nm).
Investigating factors affecting the rate of ..
The measured rate of photosynthesis as a function of absorbed wavelength correlates well with the absorption frequencies of chlorophyll a, but makes it evident that there are some other contributors to the absorption.
intensity by different amounts ..
As we can see, there is a close relationship between the action spectrum and absorption spectrum of photosynthesis. There are many different types of photosynthetic pigments which will absorb light best at different wavelengths. However the most abundant photosynthetic pigment in plants is chlorophyll and therefore the rate of photosynthesis will be the greatest at wavelengths of light best absorbed by chlorophyll (400nm-525nm corresponding to violet-blue light). Very little light is absorbed by chlorophyll at wavelengths of light between 525nm and 625 (green-yellow light) so the rate of photosynthesis will be the least within this range. However, there are other pigments that are able to absorb green-yellow light such as carotene. Even though these are present in small amounts they allow a low rate of photosynthesis to occur at wavelengths of light that chlorophyll cannot absorb.