Limiting factors of Photosynthesis.
Three factors can limit the speed of photosynthesis - light intensity, carbon dioxide concentration and temperature.
Photosynthesis - Limiting Factors - Homework Help
Farmers use methods such as burning methane/oil-fired heaters in greenhouses to increase levels of CO2 because enhanced levels of CO2 will increase the rate of photosynthesis, provided that no other factor is limiting the process.
A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.
Photosynthesis: Limiting factors Flashcards | Quizlet
6CO2 + 6H2O ----------> (light energy) C6H12O6 + 6O2.
We can see from the equation of photosynthesis that certain factors are required for the process to occur.
The chlorophyll is present in the plants' chloroplasts.
Photosynthesis (cc) photo by Metro Centric on Flickr (cc) photo by Franco Folini on Flickr (cc) photo by jimmyharris on Flickr (cc) photo by Metro Centric on Flickr A limiting factor is a VARIABLE that LIMITS the RATE of a particular process.
Limiting factors of Photosynthesis. by liam scoble on …
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 photosynthes...
The whole process
takes place all the time during the hours of daylight, but only the
light-independent reactions of photosynthesis are sometimes referred
as the dark reactions (however this does not mean they only occur in
the dark, where as in fact they occur continuously).
Limiting factors of Photosynthesis
Photosynthesis limiting factors ppt - TES Resources
However, the factor that is present at the least favourable level is the one that limits the process.
A good ppt about limiting factors on photosynthesis
Rate of photosynthesis versus light intensity with different CO2/NaHCO3 concentrations (2 factors)
IB Biology Notes - 8.2 Photosynthesis
Rate of photosynthesis versus CO2/NaHCO3 concentrations at light intensities (2 factors)
Photolab : Index > Animations > Photolab. download
Farmers can use their knowledge of these limiting factors to increase crop growth in greenhouses. They may use artificial light so that photosynthesis can continue beyond daylight hours, or in a higher-than-normal light intensity. The use of paraffin lamps inside a greenhouse increases the rate of photosynthesis because the burning paraffin produces carbon dioxide, and heat too.
Factors affecting the rate of photosynthesis 3
Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Carbon dioxide is used to make sugar in the photosynthesis reaction
Prediction: I predict that the closer the light is to the pondweed the (or the higher the light intensity) the more oxygen will be produced until a certain point where the temperature or carbon dioxide levels will be the limiting factor.
Plant Energy Transformations-Photosynthesis - …
If the light intensity is not a limiting factor, there will usually be a shortage of NADP+ as NADPH accumulates within the stroma (see light independent reaction). NADP+ is needed for the normal flow of electrons in the thylakoid membranes as it is the final electron acceptor. If NADP+ is not available then the normal flow of electrons is inhibited. However, there is an alternative pathway for ATP production in this case and it is called cyclic photophosphorylation. It begins with Photosystem I absorbing light and becoming photoactivated. The excited electrons from Photosystem I are then passed on to a chain of electron carriers between Photosystem I and II. These electrons travel along the chain of carriers back to Photosystem I and as they do so they cause the pumping of protons across the thylakoid membrane and therefore create a proton gradient. As explained previously, the protons move back across the thylakoid membrane through ATP synthase and as they do so, ATP is produced. Therefore, ATP can be produced even when there is a shortage of NADP+.
AQA Biology Unit 4.4 Lesson 2: Factors Affecting the …
So how can these factors have an effect on the rate of photosynthesis? Lets start off with the light intensity. When the light intensity is poor, there is a shortage of ATP and NADPH, as these are products from the light dependent reactions. Without these products the light independent reactions can't occur as glycerate 3-phosphate cannot be reduced. Therefore a shortage of these products will limit the rate of photosynthesis. When the carbon dioxide concentration is low, the amount of glycerate 3-phosphate produced is limited as carbon dioxide is needed for its production and therefore the rate of photosynthesis is affected. Finally, many enzymes are involved during the process of photosynthesis. At low temperatures these enzymes work slower. At high temperatures the enzymes no longer work effectively. This affects the rate of the reactions in the Calvin cycle and therefore the rate of photosynthesis will be affected.
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