Which of the following options have correct combination of a major and a rarely limiting factor respectively that affects the rate of photosynthesis, and why?
: It is required for the synthesis of sugar; Light: light saturation occurs at 10 percent of full sunlight 
: always available in the atmosphere Text Solution
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is a major limiting factor for photosynthesis. Hence increasing 
directly increase sugar synthesis until other factors limit. light saturation occurs at 10 per cent of the full sunlight. Hence, except for plants in shade or in dense forests, light is rarely a limiting factor in nature. Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis.
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