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Explain the effect of light and temperature on photosynthesis.
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Solution
The rate of photosynthesis depends upon some factors such as light, temperature, carbon dioxide, water, inhibitors etc.(i) Light: The intensity of light affects the rate of photosynthesis and thus controls the rate of production of ATP and NADPH2. An increase in light intensity will increase the rate of photosynthesis (if no other factor is limiting). Beyond the light saturation intensity, the increased intensity of light fails to increase the rate of photosynthesis is equal to that of liberated during respiration is called the light compensation point. The quality of light also affects the process as it occurs only in the visible part of spectrum i.e., 380nm-760nm wavelengths. It usually does not take place in ultraviolet and infrared rays as they are injurious to protoplasm. The highest rate of photosynthesis is in red light followed by blue light while green light is least effective in photosynthesis.(ii) Temperature: Temperature combined with other environmental conditions affects photosynthesis is low because the enzymes are affected adversely. At high temperature also the enzymes get denatured and the rate of photosynthesis declines. The optimum range of temperature for photosynthesis is 20oC-35oC. Upto 25oCthe process shows a progressive increase with rise in temperature and this increase follows Vant Hoff's law, according to which the rate of chemical reaction doubles for every 10oC rise of temperature if other factors are not limiting.
The rate of photosynthesis depends upon some factors such as light, temperature, carbon dioxide, water, inhibitors etc.
(i) Light: The intensity of light affects the rate of photosynthesis and thus controls the rate of production of ATP and NADPH2. An increase in light intensity will increase the rate of photosynthesis (if no other factor is limiting). Beyond the light saturation intensity, the increased intensity of light fails to increase the rate of photosynthesis is equal to that of liberated during respiration is called the light compensation point. The quality of light also affects the process as it occurs only in the visible part of spectrum i.e., 380nm-760nm wavelengths. It usually does not take place in ultraviolet and infrared rays as they are injurious to protoplasm. The highest rate of photosynthesis is in red light followed by blue light while green light is least effective in photosynthesis.
(ii) Temperature: Temperature combined with other environmental conditions affects photosynthesis is low because the enzymes are affected adversely. At high temperature also the enzymes get denatured and the rate of photosynthesis declines. The optimum range of temperature for photosynthesis is 20oC-35oC. Upto 25oCthe process shows a progressive increase with rise in temperature and this increase follows Vant Hoff's law, according to which the rate of chemical reaction doubles for every 10oC rise of temperature if other factors are not limiting.
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