what does not effect photosynthesis. a)humidity. b)temperature
Answers
Plants do something other living things cannot do. They produce their own food internally. Three simultaneous and related processes are taking place in living, green plants: respiration, transpiration and photosynthesis. Photosynthesis is the process that produces food for the plant that is used for both respiration (metabolism) and growth. Humidity affect photosynthesis, but it does not affect photosynthesis the same way in every plant. The main factors affecting rate of photosynthesis are light intensity, carbon dioxide concentration and temperature.
In any given situation any one of these may become a limiting factor, in other words the factors that directly affects the rate at which photosynthesis can take place masking the effects of the other factors.
Although the light dependent reactions of photosynthesis are not affected by changes in temperature, the light independent reactions of photosynthesis are dependent on temperature. They are reactions catalysed by enzymes.
Low Temperature 0–10 degrees Celsius
Enzymes are protein molecules used by living organisms to carry out biochemical reactions. The proteins are folded into a very particular shape, and this allows them to bind efficiently to the molecules of interest. At low temperatures (0–10 C), the enzymes that carry out photosynthesis do not work efficiently, and this decreases the photosynthetic rate. This leads to a decrease in glucose production and will result in stunted growth. For plants inside a greenhouse, the installation of a greenhouse heater and thermostat prevents this from occurring.
Medium Temperatures 10–20 degrees Celsisus
At medium temperatures (10–20 C), the photosynthetic enzymes work at their optimum levels, so photosynthesis rates gauge high. Depending on the particular plant in question, set the greenhouse thermostat to a temperature within this range for best results. At these optimum temperatures, the limiting factor becomes the diffusion of carbon dioxide into the leaves.
High Temperatures 20–40 degrees Celsisus
At high temperatures (20–40 C), the rate of photosynthesis decreases because the enzymes do not work as efficiently at this temperature. This is despite the increase of carbon dioxide diffusion into leaves. At or exceeding 40 degrees Celsius the enzymes that carry out photosynthesis lose their shape and functionality, and the photosynthetic rate declines rapidly. The graph of photosynthetic rate versus temperature presents a curved appearance with the peak rate occurring close to room temperature. A greenhouse or garden that provides optimum light and water, but gets too hot, produces less vigorously.
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