Tropisms
Published on Nov 20, 2015
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PRESENTATION OUTLINE
The turning of all or part of an organism in a particular direction in response to an external stimulus.
Photo by -nanio-
The orientation of a plant or organism in response to light , either toward the source of light (positive phototropism) or away from it (negative phototropism)
Photo by r_neches
The growths of the parts of plants with respect to the force of gravity . The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.
Photo by ro6ot
THIGMOTROPISM
Photo by Tony Frates
