The Effect of Light Intensity on the Rate of Photosynthesis in an Aquatic Plant
Introduction
The input variable I will be investigating is light, as light is just
one of the 4 factors required in the green-plant process of
photosynthesis. Photosynthesis is the process by which green-plants
use sunlight, carbon dioxide, water & chlorophyll to produce their own
food source. This process is also affected by the temperature
surrounding the plant (the species of plant we experimented with, pond
weed, photosynthesised best at around 20 degrees centigrade.)
Light, temperature & CO2 are known as limiting factors, and each is as
important as the next in photosynthesis. Light is the factor that is
linked with chlorophyll, a green pigment stored in chloroplasts found
in the palisade cells, in the upper layer of leaves. The light is
absorbed by the chloroplasts to produce the chlorophyll. The chemical
& word equation for photosynthesis is stated below:
Sunlight
Carbon dioxide + water -----------------> Glucose + oxygen
Chlorophyll
S
6CO2 + 6H20 -----------------> C6H12O6 + 6O2
C
Light in photosynthesis
Photosynthesis cannot take place without light, as light is one of the
factors by which the green plant photosynthesises (makes its own food
source) Light provides the plant with energy to make the chlorophyll
which in turn absorbs the light. From this it can be said that the
more light a plant is provided with (the more of a limiting factor is
takes in) then the higher the rate at which the pond weed, or any
plant, will give off a product of photosynthesis i.e. glucose or
oxygen. From this the knowledge can be gained that depriving the
aquatic plant I will be investigating of all light would be a
pointless investigation, as no outcome could be measured. Instead I
will vary the light intensity the plant is provided with. I will do
this by placing the light at different distances from the aquatic
plant. I also thought about varying the wattage of the lamp I will be
Analysis of the Absorption of Green Light Versus Red Light Absorption in Spinach Leaves. The goal of the experiment was to determine if green light had less ability to absorb than red light in spinach leaves. This was done by separating the photosynthetic pigments (chlorophyll a, chlorophyll b, carotene and xanthophylls) from one another using paper chromatography. The separated pigments were then analyzed for their absorption spectrum using a spectrographometer.
Investigating the Effect of Light Intensity on Photosynthesis in a Pondweed Aim: To investigate how the rate of photosynthesis changes at different light intensities, with a pondweed. Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis. The plant may stop photosynthesising when the pondweed is at the furthest distance from the lamp (8cm). Without light, the plant will stop the photosynthesising process, because, light is a limited factor. However once a particular light intensity is reached the rate of photosynthesis stays constant, even if the light intensity is the greatest.
DPIP will be used to determine the rate at which the cholorplasts are being reduced. The spectrophotometer will establish the wavelength of light that penitrats the chloroplast solution in turn determining the amount of electrons reduced. In the dark reactions, the spectrophotometer will measure the amount of light passing through a darker solution of DPIP and chloroplasts. In the light reactions, the lighter solution, caused by reduction of the chloroplasts, will allow a larger amount of light to pass through to the photocell of the spectrophotometer. Thus, the spectrophotometer will prove wheter the light or dark reactions affect the rate of photosynthesis in chloroplasts. We will also be using a reference solution made of water, phosphate buffer, and active chloroplasts. The purpose of this solution will be used to set the transmittance level for the experiment. The control solution, which is different than the reference solution, is comprised of water, phosphate buffer, and DPIP. It will be used to prove that the three element of the solution do affect the results- it is strictly the chloroplasts that are subjected to the light/dark conditions.
at the small end of the axis to see a more reliable pattern. I could
This shows that there could be three variables in this experiment, carbon dioxide, water and light energy. So in our case the variable light energy (light intensity) will be used. The equation also shows that if there is more light energy then more glucose and oxygen will be produced.
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
An Analysis and Evaluation of Data from Photosynthesis Experiments Graph analysis This is my analysis for the investigation in to the affect of light intensity on the rate of photosynthesis to the Canadian pondweed, elodea. In the results the pattern is that when the light intensity is higher the readings are generally higher. On the graph the less the light intensity the lower the gradient of the curve. the equation for the photosynthesis process is; CO2 + 2H2O + Light Energy = =
Investigating the Link Between Wavelength of Light and Rate of Photosynthesis PROBLEM = = = = =
To make the test fair I will use the same amount of water and the leaf
To make sure that my test is fair I will make sure to keep all the
The Effect of Light Intensity on Photosynthesis Of Elodea Canadensis Introduction I wanted to find out how much the light intensity affected the Photosynthesis in Elodea Camadensa. I decided to do this by measuring the amount of oxygen created during photosynthesis. Photosynthesis is the procedure all plants go through to make food. This process uses Carbon dioxide, water and light energy. It produces Oxygen and Glucose.
* Count the number of bubbles seen in 1 minute which is a way of
An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis. Introduction Photosynthetics take place in the chloroplasts of green plant cells. It can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: [ IMAGE ] 6CO 2 + 6H20 C 6 H12 O 6 + 6O2 It has been proven many times that plants need light to be able to photosynthesize, so you can say that without light the plant would neither photosynthesize nor survive.
Experiment #1: The purpose of this experiment is to investigate the effects of baking soda and light intensity on the rate of photosynthesis of green spinach leave through the observation of floating disk.
Increases in temperature can decrease the efficiency of photosynthesis; however the extent of this impact may be determine on the species' dependency on light.