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Help me!! environmental factors for photosynthesis

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Help me!! environmental factors for photosynthesis

Postby maraldy » Wed Nov 09, 2005 1:49 am

What combination of environmental factors would produce an optimum rate of photosynthesis for most plants??
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Postby mith » Wed Nov 09, 2005 4:25 am

What does photosynthesis need(raw materials) and what increases the chemical reactions?
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Postby rosebud » Wed Nov 09, 2005 9:22 am

light intensity

temp

suitable pigments (chlorophyll/carotenoids)

amount of water

carbon dioxide concentration

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Postby rambo » Wed Nov 09, 2005 10:58 am

the amount of sun light recieved daily. earth is another factor because good soil nourishes the cells. a certain amount of water not too much.
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Postby mith » Wed Nov 09, 2005 12:41 pm

soil nutrition doesn't directly affect photosynthesis, trace minerals are needed but more doesn't boost photosynthesis rate.
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Re: Help me!! environmental factors for photosynthesis

Postby FireWitch1 » Thu Jan 03, 2008 12:45 am

Photosynthesis is directly affected by environmental factors. The most obvious of these factors is light. In general, the rate of photosynthesis increases as light intensity increases, until the point of light saturation is reached. At that point, the rate of photosynthesis levels off.
Carbon dioxide concentration affects the rate of photosynthesis in a similar manner. Once a certain concentration of carbon dioxide is present, the reactions of photosynthesis can not proceed any further.
Photosynthesis also operates best within a certain range of temperatures.

Light, carbon dioxide concentration, temperature, and other environmental factors interact with one another to determine the optimum level of photosynthesis for a particular plant in its environment.
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Re: Help me!! environmental factors for photosynthesis

Postby MrMistery » Thu Jan 03, 2008 1:00 pm

FireWitch1 wrote:Photosynthesis is directly affected by environmental factors. The most obvious of these factors is light. In general, the rate of photosynthesis increases as light intensity increases, until the point of light saturation is reached. At that point, the rate of photosynthesis levels off.



Depends on the type of plant. Plotting the intensity of photosynthesis with the amount of light will produce an optimal curve in the case of a C3 plant(after the optimum temperature, the intensity decreases - too much light inhibits photosynthesis) and a saturation plant in case of a C4 or CAM plant(after the optimum temperature, the intensity remains the same. the plant can protect itself from too much light). Also note an important difference between schiatophile and heliophile plants

FireWitch1 wrote:
Carbon dioxide concentration affects the rate of photosynthesis in a similar manner. Once a certain concentration of carbon dioxide is present, the reactions of photosynthesis can not proceed any further.
Photosynthesis also operates best within a certain range of temperatures.

An increase in CO2 concentration to 3% will be optimum for most plants. However, over 5% will inhibit photosynthesis(why, i don't know). Also note the fact that more CO2 in the atmosphere due to global warming will not be beneficial : the plant will produce more organic carbon but less organ nitrogen. Which sucks.

FireWitch1 wrote:
Light, carbon dioxide concentration, temperature, and other environmental factors interact with one another to determine the optimum level of photosynthesis for a particular plant in its environment.

Temperature: also huge difference between C3 plants(optimum at 25 celsius), C4(optimum at 35-40) and CAM plants(around the same as C4 plants, but with the huge difference in physiology).
Water: also huge difference between C3 plants(which require a lot of water), C4(little water) and CAM(can survive with almost no water, like in deserts).

Any questions are welcome.
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