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Question
Explain the factors affecting the rate of photosynthesis.
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Solution
External factors that affect the process of photosynthesis are:(i) Light: Light has a manifold effect on the rate of photosynthesis. With the increase in the light intensity, the rate of photosynthesis increases. Except on a cloudy day, light is never a limiting factor in nature. For photosynthesis the visible range of the spectrum (between 350 to 750 mm) is essential. Maximum photosynthesis occurs in red parT and minimum in green part of the spectrum. Ultraviolet light has a lethal effect on plants if the exposure is for a prolonged period.(ii) CO2 concentration: CO2 is one of the basic raw materials of photosynthesis, therefore, its concentration affects the rate of photosynthesis. Because of its low concentration (0.03%) in atmosphere it becomes a limiting factor in natural photosynthesis. At optimum temperature and light intensity if the CO2 supply is increased, the rate of photosynthesis increases markedly.(iii) Temperature: The rate of photosynthesis is not directly controlled by temperature but very low and very high temperature affect the photosynthetic rate adversely.(iv) Water: Water indirectly affects the rate of photosynthesis. The rate of photosynthesis is adversely affected when the amount of water is less.
External factors that affect the process of photosynthesis are:
(i) Light: Light has a manifold effect on the rate of photosynthesis. With the increase in the light intensity, the rate of photosynthesis increases. Except on a cloudy day, light is never a limiting factor in nature. For photosynthesis the visible range of the spectrum (between 350 to 750 mm) is essential. Maximum photosynthesis occurs in red parT and minimum in green part of the spectrum. Ultraviolet light has a lethal effect on plants if the exposure is for a prolonged period.
(ii) CO2 concentration: CO2 is one of the basic raw materials of photosynthesis, therefore, its concentration affects the rate of photosynthesis. Because of its low concentration (0.03%) in atmosphere it becomes a limiting factor in natural photosynthesis. At optimum temperature and light intensity if the CO2 supply is increased, the rate of photosynthesis increases markedly.
(iii) Temperature: The rate of photosynthesis is not directly controlled by temperature but very low and very high temperature affect the photosynthetic rate adversely.
(iv) Water: Water indirectly affects the rate of photosynthesis. The rate of photosynthesis is adversely affected when the amount of water is less.
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