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(B) Photosynthesis is influenced by several external factors,including light,temperature,$CO_2$ concentration,and water.$1$. Light: Light is an essent

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$II$

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(B) Photosynthesis is influenced by several external factors,including light,temperature,$CO_2$ concentration,and water.$1$. Light: Light is an essential factor for photosynthesis. It affects the rate directly through its intensity,quality,and duration.$2$. Carbon Dioxide $(CO_2)$: $CO_2$ is a major limiting factor. It is directly involved as a substrate in the Calvin cycle (dark reactions) for the synthesis of carbohydrates.$3$. Temperature: The dark reactions of photosynthesis are enzymatic and are directly controlled by temperature. The light reactions are also temperature-sensitive,though to a lesser extent.$4$. Water: Water is a reactant in photosynthesis,but its effect on the process is primarily indirect. Water stress causes the stomata to close,which reduces $CO_2$ availability for gaseous exchange. Additionally,water stress causes leaves to wilt,reducing the surface area available for photosynthesis and decreasing metabolic activity. Therefore,water acts more through its physiological effect on the plant rather than directly on the photosynthetic machinery.

Which of the following factors affecting photosynthesis does not have a direct effect on the process?
$I$. Light
$II$. Water
$III$. Temperature
$IV$. Carbon Dioxide
Select the correct option.

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Which of the following factors affecting photosynthesis does not have a direct effect on the process?$I$. Light$II$. Water$III$. Temperature$IV$. Carbon DioxideSelect the correct option.