Phototropism - the specific movement of a plant part toward a light source.
Pigment - The substance in paint or anything that absorbs light, producing (reflecting) the same color as the pigment.
phototropism A growth response to light. Growth of a plant toward a light source is the most common example.
phytoplasma A microscopic, bacteria-like organism that lacks a cell wall. Previously called mycoplasma.
phototropism (adj. phototropic)Growth or movement toward or away from a light source.
Paul: That's an interesting phenomenon known as phototropism. When sunlight hits one side of a plant, the most rapid cell growth occurs on the shaded side of the plant.
The movement occurs as the stems grow upward, while the large flowers respond and grow towards the light, a phenomenon known as phototropism. The flowers open wide during the day and close at night.
auxins search for term- growth promoting hormones that cause cell elongation, and are responsible for many developmental responses including phototropism.
 See also: Light, Plant, Produce, Growing, Water
  
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