The Effect of Light Intensity and Temperature on the Rate of Photosynthesis
Aim
The aim of my experiment is to determine whether intensity of light
and temperature would affect the rate of photosynthesis in a plant. To
do this, I will place a piece of pondweed in varying light intensities
and temperatures, and observe the amount of oxygen being given off. I
am using pondweed because of its unusual quality of giving off bubbles
of gas from a cut end, when placed in water.
Introduction
Photosynthesis occurs only in the presence of light, and takes place
in the chloroplasts of green plant cells. Photosynthesis can be
defined as the production of simple sugars from carbon dioxide and
water causing the release of sugar and oxygen.
The chemical equation for photosynthesis can be expressed as:
(light)
6CO2 + 6H2O-------------- C6H12O6 + 6O2
(In the presence of chlorophyll)
The word equation:
Carbon dioxide + Water------------ Glucose + Oxygen
The fact that all plants need light in order to photosynthesise has
been proven many times in experiments, and so it is possible to say
that without light, the plant would die. The reason that light
intensity does affect the rate of photosynthesis is because light is
the source of energy which, falls on the chloroplasts in a leaf and is
trapped by the chlorophyll, which then makes the energy available for
chemical reactions in the plant. Thus, as the amount of sunlight, or
in this case light from a bulb, falls on the plant, more energy is
absorbed, so more energy is available for the chemical reactions, and
so more photosynthesis takes place in a given time.
The...
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...ary the amount of CO2. The plant would be
kept at a constant distance from the lamp and a constant volume of
water would be added to the sodium hydrogen carbonate. Another
experiment using almost identical apparatus would be to vary the color
of the light the plant absorbs. Using translucent color filters in
front the lamps could vary this. Since light wave length has already
been identified as a variable of photosynthesis, it would be
interesting to actually test it. The only problem of this experiment
is that there is no way to define or "measure" the color of light.
Wave length would be a solution but this cannot be measured with
available equipment. We only have a general idea of how to class
colors. Because of this, the colored light experiment should not be
taken as seriously as light intensity or carbon dioxide.
Investigating the Effect of Light Intensity on the Size of a Plantain Leaf Title: To investigate the effect of light intensity on the size of a plantain leaf. Hypothesis: I predict that the size of the plantain leaves would increase as the light intensity decreases. Therefore, plantain leaves found in the shade will have larger surface areas than leaves found in an open area. Theory: Sunlight is an essential factor need to complete the process of photosynthesis.
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.
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
[IMAGE]Carbon dioxide + water Light Energy glucose + oxygen Chlorophyll [IMAGE]6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2 Chlorophyll Photosynthesis occurs in the leaves of the plant in the palisade layer. Chlorophyll in the cells in the palisade layer absorb light for photosynthesis. The plant releases the oxygen created in photosynthesis back into the air but it uses or stores the glucose for energy, respiration, growth and repair. The leaves and plants are also specially adapted for photosynthesis in their structure and cell alignment. Preliminary Experiment Apparatus * Piece of Elodea Canadensis * Bulb * Voltmeter * Test tube * Beaker * Box *
* Count the number of bubbles seen in 1 minute which is a way of
Photosynthesis in simpler turns is the ability of a live plant to carry on its chemical process by the use of light energy. Photosynthesis can not take place when there is absolutely no light, instead it stores the light it captures during the day, and uses it when needed. Photosynthesis can take place in land plants and aquarian plants such as algae. There are many factors that influence the ability of a plant to go through photosynthesis, such as light, the color of light and amount of water and or light.
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
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
the distance from the light source to the plant. Output - The rate of photosynthesis is to be measured by counting the bubbles of oxygen produced by the plant every two minutes, and therefore finding the rate of photosynthesis. Control - The amount of water available to the Elodea will stay the same. same level as the 400 cm3 beaker. The colour of the lamp will stay the same (yellow) as to plants Chlorophyll easily absorbs blue light.
Photosynthesis is the process in which living cells from plants and other organisms use sunlight to produce nutrients from carbon dioxide and water, the image below “Diagram of photosynthesis 1,” helps show this process. Photosynthesise generally creates oxygen as a by-product through the use of the green pigment, chlorophyll, found in the plant that helps this reaction occur. “Photosynthesis provides us with most of the oxygen we need in order to breathe. We, in turn, exhale the carbon dioxide needed by plants,” (factmonster,2017). This is able to show us why photosynthesis is so greatly needed to occur through plants in order to give one another essentials needed for continuity of life. “Plants perform photosynthesis because it generates the food and energy they need for growth and cellular respiration,” (photosynthesieeducation, 2016).