Chloroplast Movements, like some of the other time-lapse microscopy images in the exhibition, shows the movements of cellular structures (organelles) in response to light stimuli. Think of adjusting your blinds in response to bright sunlight. In plants, the adjustment is made by dynamic protein filaments that drag chloroplasts toward or away from the cell periphery in response to varying intensities of light. Through detection of these responses, scientists have discovered palpable evidence of irritability—one of the defining qualities of life.
