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Stomata from detached epidermis of common dayflower (Commelina communis) were treated with saturating photon fluxes of red light. In a parallel treatment, stomata treated with red light were also illuminated with blue light (indicated by arrow). From the graphs shown below, select the correct pattern of stomata opening (solid lines and dotted lines represent stomatal aperture under red and blue lights, respectively).
Both red and blue light stimulate stomatal opening. Because chlorophyll also absorbs these wavelengths, sensitivity to red and blue light is consistent with a role of guard cell...