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Unformatted text preview: movement. Such leaves have pulvini. Turgor changes in the parenchyma cells on either side of the vascular tissue in the pulvinus cause the leaf to open or to close. The change in turgor is controlled by circadian rhythms, and is similar to the mechanisms that open and close stomata. Oxalis Circadian Rhythm Maintaining circadian rhythm without light cues...
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- Fall '09