At a certain carbon dioxide concentration, the rate of photosynthesis remain constant from point B to point C on the graph. The process occurs within special structures called chloroplasts located in the cells of leaves. The decrease in water contents of the soil from field capacity to the permanent wilting point results in the decreased photosynthesis. Since glucose levels within plants are difficult to measure, scientists utilize the amount of carbon dioxide assimilation or its release as a means to measure photosynthetic rates. As I sit in my study in England, the sun is shining brightly, but the temperature outside is only 5ºC. The rate of photosynthesis depends on the concentration of enzymes and chlorophyll.
There are three temperature regimes over which the rate of photosynthesis changes. For a certain number of days, buds of plants need to get exposed to chilling hours, which is below a critical temperature, to resume growth during spring. During transpiration, the water in the roots is being pulled up through the plant Xu et al. According to this hypothesis, when a process is influenced by a number of factors, the rate of the process is limited by the slowest factor. Light intensity has an effect on the gene expression levels of various components of the photosynthetic machinery, too. On the day of the experiment, cut 10 cm lengths of Elodea, put a paper-clip on one end to weigh them down and place in a boiling tube of water in a boiling tube rack, near a high intensity lamp, such as a halogen lamp or a fluorescent striplight. However, temperatures above 40 C causes the process to slow down.
The palisade cells contain many chloroplasts, which are green organelles. The inhibitory effect is primarily attributed to increased dehydration of protoplasm and also stomatal closure. But it appears as if they're still absorbing it. Lesson organisation The work could be carried out individually or in groups of up to 3 students counter, timekeeper and scribe. Same thing happens when plants are transferred from dark to light. When the intensity of light falling on a photosynthesizing organ is increased beyond a certain point, the cells of that organ become vulnerable to chlorophyll catalyzed photo-oxidations.
Further any increase in light intensity will not result in an increase in the rate of photosynthesis. Factors affecting the rate of photosynthesis The term rate always involves time, so the rate of photosynthesis can be considered to be how fast photosynthesis takes place. To achieve optimum growth of some plants, farmers keep them in greenhouses that regulate conditions such as humidity and temperature. However, water deficit stress reduces the rate of photosynthesis by affecting the process indirectly. Water: Water is an essential raw material in carbon assimilation. However, for photosynthesis at temperatures above 40°C the rate slows down.
Although water is needed as a raw material for photosynthesis, don't bother trying to investigate water as a variable - plants normally wilt and wither long before water restricts photosynthesis at the biochemical level. Variables The input variable which will be used in this investigation will be the light intensity this will be a 100Watt bulb being moved closer and further away from… 1599 Words 7 Pages The effects of light intensity on rate of photosynthesis Research Question: How will the change in light intensity by changing the distance between the light source and the plant affect the amount of bubbles produced by a marimo moss ball? When… 2410 Words 10 Pages experiment conducted by Claire Dunne, Eilis Brien and myself about the effects of light intensity, representing the three seasons of summer, spring, autumn and winter, on the transpiration rate of mangrove shoots. Quality: The action spectrum for photosynthesis in leaves shows two major peaks, one in the red and the other one in the blue Fig. Examples of… 1912 Words 8 Pages Plan I plan to investigate how light intensity affects the rate of photosynthesis in pondweed. Prediction I predict When I do this, I will then find the light intensity by dividing the number which came up on the light meter into 1; this will be the light intensity.
The mesophyll cells contains spongey cells which have large gaps between each cell to allow oxygen and carbon dioxide circulation. It's performing an endothermic reaction on quite a large scale in a way that produces very specific products. Dehydration may even damage the micromolecular structure of the chloroplasts. It's going to take a lot of controlling through various other chemicals, and the process itself is very complex, so I'd imagine it'd eat up a decent amount of energy. High light intensities affect the rate of photosynthesis.
I am using pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in… 1148 Words 5 Pages around the world in a wide variety of environments, but how does the environment affect photosynthesis rate? Water Water is one of the raw materials used in photosynthesis. Light intensity has a very large effect on the rate of photosynthesis. There are three cardinals of temperature for photosynthesis. First I'm going to look at the different properties of Low Carbon Steel. Theory: Before I predict what will happen I must look at how photosynthesis occurs. However, at high concentrations the cells die. First clip that end of the pondweed that was not cut.
Low Temperature Enzymes are protein molecules used by living organisms to carry out biochemical reactions. Additionally, low temperatures cause plants to grow poorly. Inside the leaves of a plant there is a green substance, this substance… 2120 Words 9 Pages 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. Plants also need plenty of water too. I suspect the rate of photosynthesis is limited by temperature today. Discuss and explain your answers. Light absorption by chlorophyll a and thus, the efficiency of photosynthesis, peak at about 450 nanometers and 650 nanometers.
Depending on the particular plant in question, set the greenhouse thermostat to a temperature within this range for best results. It may be stated that direct effect of O 2 on photosynthesis remains to be understood. A greenhouse or garden that provides optimum light and water, but gets too hot, produces less vigorously. What is the optimal temperature for yeast to metabolize sugars? Abstract: The overall aim of this report was the conduct an experiment based how different light intensity levels, representing the four seasons in a year: summer, spring, autumn and winter, affects the transpiration rate in a mangrove plant. High Temperatures At temperatures above 68 degrees Fahrenheit, or 20 degrees Celsius, the rate of photosynthesis decreases because the enzymes do not work as efficiently at this temperature.