Photosynthesis Investigation
Investigate the affect of light on the rate of
photosynthesis of a piece of pondweed
I am going to investigate how light will affect the rate of
photosynthesis of pondweed.
I predict that as the light becomes less intense, I do this by moving
the light away from the pondweed, the rate of photosynthesis will
decrease.
The formula for photosynthesis is:
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6CO2 + 6H2O C6O12H6 + 6O2
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Carbon Dioxide + Water Glucose + Oxygen
There are 3 major factors that limit the rate of photosynthesis, these
are:
· Temperature
· Amount of Carbon Dioxide
· Light Intensity
The only factor that we are able to measure successfully in school is
the affect of light on the rate of photosynthesis, so we have to
believe that the level will remain the same. This is very unlikely to
happen so we could end up with a few rouge results.
As the plant is moved closer to the light source. The light intensity
increases so the rate of photosynthesis should increase.
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[IMAGE]As the plant is moved further away from the light the light
intensity decreases and therefore the rate of photosynthesis should
also decrease.
Because oxygen is a product of photosynthesis we will measure the
amount of bubbles against time. This is very inaccurate as no two
bubbles will contain the same amount of oxygen, but it should give us
some idea of what is happening. This is why we are using pondweed, as
it will allow to estimate how much oxygen is being given off. The
bubbles will be visible, as the pondweed is underwater.
Water
Pondweed
Oxygen Bubbles
Equipment:
· 1 piece of pondweed
· 1 250ml Pyrex beaker
· 1 stop clock
· 1 ruler
· 1 60 watt light bulb
· 1 stand
· 1 boss clamp
· a pair of scissors
Elodea also known as Elodea canadensis is a genus of aquatic plants. They are also called waterweeds and is mainly used in aquarium vegetation. It plays a significant role in aquatic vegetation as it produces a significant amount of carbon dioxide under the perfect conditions. Elodea mainly grows in shallow water and can also be sometimes found in deep water. The plant for this experiment is kept in a water tank. We use elodea for this experiment as this is a very good plant that play a crucial part in our experiment. The amount of carbon dioxide produced by the plant during the experiment can be used to understand the rate of the reaction.
For part one of the experiment, my team asked the question of which cell fraction of the measured pea seedlings will have a higher ratio of chloroplasts? My group tested for the activity of chloroplasts with three different pairs of cell fractions by two conditions of light and dark in three readings. The first two cell fractions, pellet one and two (P1, P2), are the hard sediments found at the bottom of a tube after it has been centrifuged (which are specimen, like the mitochondria and chloroplast, that are isolated from the rest) (Leicht and McAllister, 2016). The last cell fraction used was the supernatant two (S2), which is just the free liquid surrounding the pellet after the centrifuging of P2 (Leicht and McAllister, 2016). To test for this, DCIP (a chloroplast isolation buffer) was used to
I also predict that as the light is moved closer to the plant there will be more bubbles (oxygen) produced due to the increase of photosynthesis speed explained above. So in conclusion I predict that the more light intensity there is on the plant the faster the rate of photosynthesis there will be.
As the light is increased so would the rate of photosynthesis. Apparatus: boiling tube, 250ml beaker, bench lamp, ruler, sodium
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.
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
= > [CH2O} + O2 + H2O, This shows that when the light intensity is increased the rate of reaction will be more quicker he only anomalous result there was, is the one in the 100 watt result the reading after 5 minutes is anomalous because it does not follow the predicted pattern of increasing in the production of gas because it is lower I know from my own knowledge of photosynthesise that when the light intensity is increased the rate of reaction will be more quicker because many plants and trees photosynthesise quicker in stronger light and photosynthesise slower in dimly lit places. The chlorophyll absorbs light energy and enables it to be used by the plant for building up sugar. The overall effect is that energy is transferred from sunlight to sugar molecules.
filters and count the number of oxygen bubbles given off using a pencil dot technique. Prediction I predict that with a blue filter the photosynthetic rate will be the as blue is a highly absorbent color it also has a short wavelength carries the most energy. The color to have the least photosynthetic rate will be green as it has quite a short wavelength so a lot of energy will be reflected by the plant and not absorbed in the sand. Yellow and orange will have average photosynthetic rates. although orange will be slightly more as it is more absorbent than yellow even low it has a longer wavelength and does not carry as much.
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.
Cellular respiration is the ability of a cell in an organism to metabolize chemicals in the production of adenosine triphosphate (ATP), the main energy molecule of the cell. There are two forms of cellular respiration. Chemotrophic respiration, which is used by animals and phototrophic respiration (a.k.a. photosynthesis) used by plants and fungi. Chemotrophic respiration requires oxygen to efficiently make ATP and gives off carbon dioxide as a waste product. Photosynthesis requires carbon dioxide and gives off oxygen as a waste product. Further analysis of these two types of respiration will show why these processes are related and how they differ.
The opening and closing of stomata is one example of this movement. There are a large amount of growth conditions that can affect a plant. One of the most important of these conditions concerns the type of availability of light present for photosynthesis. By controlling the type of light that a plant receives, its growth can be affected.
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.
This is the same if there is the light intensity is too high as this can damage the chloroplasts in plants and this will minimize the rate of photosynthesis. As shown in the graph as the light intensity increases, the photosynthesis rate increases until a point is reached where the rate begins to level off into a plateau. At a low light intensity, photosynthesis occurs slowly because only a small quantity of ATP and NADPH is produced. As the light intensity shown in the graph is gradually increasing, more ATP and NADPH (NADH is used in cellular respiration and NADPH is used in photosynthesis) are produced, which means more oxygen and sugar is produced, therefore increasing the rate of photosynthesis. But as the light intensity increases even more and past a certain light intensity on the graph, this is due to the other factors such as carbon dioxide limiting the rate of
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.
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.