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I'd first like to briefly mention what the P700 and P680 refers to. These are the reactions centers of the photosystems. The Photosystems are where the light is absrobed and converted to the form of electrons. The light is absorbed by the chlorophyll molecules and the energy is transferred to the reaction center which transfers that energy into an electron ...


Curling up is due to turgor pressure. Quoting from wikipedia Loss of turgor pressure in these cells causes leaves to "roll up" during water stress More scientific reference , on morphology, on mechanism, on development, some genetics and on physics.

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