Effects of light and temperature on photosynthesis

Effects of Light
– needed to provide energy for splitting of water
– Essential for the activation/excitation of the chlorophyll molecule
– initiates the sequence of the enzymatic reactions in the photosystems I and II (cyclic and noncyclic photophosphorylation)
– reaction generate energy (ATP) used in CO2 fixation
– increasing light intensity beyond the action spectrum will not increase rate of photosynthesis
Effects of Temperature
– needed for optimum activity of enzymes
– extremely low temperatures slow down enzymes action
– very high temperature denature enzymes.

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